diff --git a/dist/_30s.es5.js b/dist/_30s.es5.js
index 4a5cff1f9..f15107273 100644
--- a/dist/_30s.es5.js
+++ b/dist/_30s.es5.js
@@ -1023,6 +1023,23 @@ var objectToPairs = function objectToPairs(obj) {
   });
 };
 
+var observeMutations = function observeMutations(element, callback, options) {
+  var observer = new MutationObserver(function (mutations) {
+    return mutations.forEach(function (m) {
+      return callback(m);
+    });
+  });
+  observer.observe(element, Object.assign({
+    childList: true,
+    attributes: true,
+    attributeOldValue: true,
+    characterData: true,
+    characterDataOldValue: true,
+    subtree: true
+  }, options));
+  return observer;
+};
+
 var off = function off(el, evt, fn) {
   var opts = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
   return el.removeEventListener(evt, fn, opts);
@@ -1656,7 +1673,7 @@ var zipObject = function zipObject(props, values) {
   }, {});
 };
 
-var imports = { JSONToFile: JSONToFile, RGBToHex: RGBToHex, UUIDGeneratorBrowser: UUIDGeneratorBrowser, UUIDGeneratorNode: UUIDGeneratorNode, anagrams: anagrams, arrayToHtmlList: arrayToHtmlList, average: average, averageBy: averageBy, bottomVisible: bottomVisible, byteSize: byteSize, call: call, capitalize: capitalize, capitalizeEveryWord: capitalizeEveryWord, chainAsync: chainAsync, chunk: chunk, clampNumber: clampNumber, cleanObj: cleanObj, cloneRegExp: cloneRegExp, coalesce: coalesce, coalesceFactory: coalesceFactory, collectInto: collectInto, colorize: colorize, compact: compact, compose: compose, copyToClipboard: copyToClipboard, countBy: countBy, countOccurrences: countOccurrences, createElement: createElement, createEventHub: createEventHub, currentURL: currentURL, curry: curry, decapitalize: decapitalize, deepFlatten: deepFlatten, defer: defer, detectDeviceType: detectDeviceType, difference: difference, differenceWith: differenceWith, digitize: digitize, distance: distance, distinctValuesOfArray: distinctValuesOfArray, dropElements: dropElements, dropRight: dropRight, elementIsVisibleInViewport: elementIsVisibleInViewport, elo: elo, equals: equals, escapeHTML: escapeHTML, escapeRegExp: escapeRegExp, everyNth: everyNth, extendHex: extendHex, factorial: factorial, fibonacci: fibonacci, filterNonUnique: filterNonUnique, findLast: findLast, flatten: flatten, flip: flip, forEachRight: forEachRight, formatDuration: formatDuration, fromCamelCase: fromCamelCase, functionName: functionName, functions: functions, gcd: gcd, geometricProgression: geometricProgression, getDaysDiffBetweenDates: getDaysDiffBetweenDates, getScrollPosition: getScrollPosition, getStyle: getStyle, getType: getType, getURLParameters: getURLParameters, groupBy: groupBy, hammingDistance: hammingDistance, hasClass: hasClass, hasFlags: hasFlags, head: head, hexToRGB: hexToRGB, hide: hide, httpGet: httpGet, httpPost: httpPost, httpsRedirect: httpsRedirect, inRange: inRange, indexOfAll: indexOfAll, initial: initial, initialize2DArray: initialize2DArray, initializeArrayWithRange: initializeArrayWithRange, initializeArrayWithValues: initializeArrayWithValues, intersection: intersection, invertKeyValues: invertKeyValues, isAbsoluteURL: isAbsoluteURL, isArray: isArray, isArrayLike: isArrayLike, isBoolean: isBoolean, isDivisible: isDivisible, isEven: isEven, isFunction: isFunction, isLowerCase: isLowerCase, isNull: isNull, isNumber: isNumber, isObject: isObject, isPrime: isPrime, isPrimitive: isPrimitive, isPromiseLike: isPromiseLike, isSorted: isSorted, isString: isString, isSymbol: isSymbol, isTravisCI: isTravisCI, isUpperCase: isUpperCase, isValidJSON: isValidJSON, join: join, last: last, lcm: lcm, longestItem: longestItem, lowercaseKeys: lowercaseKeys, luhnCheck: luhnCheck, mapKeys: mapKeys, mapObject: mapObject, mapValues: mapValues, mask: mask, maxBy: maxBy, maxN: maxN, median: median, memoize: memoize, merge: merge, minBy: minBy, minN: minN, negate: negate, nthElement: nthElement, objectFromPairs: objectFromPairs, objectToPairs: objectToPairs, off: off, on: on, onUserInputChange: onUserInputChange, once: once, orderBy: orderBy, palindrome: palindrome, parseCookie: parseCookie, partition: partition, percentile: percentile, pick: pick, pipeFunctions: pipeFunctions, pluralize: pluralize, powerset: powerset, prettyBytes: prettyBytes, primes: primes, promisify: promisify, pull: pull, pullAtIndex: pullAtIndex, pullAtValue: pullAtValue, randomHexColorCode: randomHexColorCode, randomIntArrayInRange: randomIntArrayInRange, randomIntegerInRange: randomIntegerInRange, randomNumberInRange: randomNumberInRange, readFileLines: readFileLines, redirect: redirect, reducedFilter: reducedFilter, remove: remove, reverseString: reverseString, round: round, runAsync: runAsync, runPromisesInSeries: runPromisesInSeries, sample: sample, sampleSize: sampleSize, scrollToTop: scrollToTop, sdbm: sdbm, select: select, serializeCookie: serializeCookie, setStyle: setStyle, shallowClone: shallowClone, show: show, shuffle: shuffle, similarity: similarity, size: size, sleep: sleep, sortCharactersInString: sortCharactersInString, sortedIndex: sortedIndex, splitLines: splitLines, spreadOver: spreadOver, standardDeviation: standardDeviation, sum: sum, sumBy: sumBy, sumPower: sumPower, symmetricDifference: symmetricDifference, tail: tail, take: take, takeRight: takeRight, timeTaken: timeTaken, toCamelCase: toCamelCase, toDecimalMark: toDecimalMark, toKebabCase: toKebabCase, toOrdinalSuffix: toOrdinalSuffix, toSafeInteger: toSafeInteger, toSnakeCase: toSnakeCase, toggleClass: toggleClass, tomorrow: tomorrow, transform: transform, truncateString: truncateString, truthCheckCollection: truthCheckCollection, unescapeHTML: unescapeHTML, union: union, untildify: untildify, validateNumber: validateNumber, without: without, words: words, yesNo: yesNo, zip: zip, zipObject: zipObject };
+var imports = { JSONToFile: JSONToFile, RGBToHex: RGBToHex, UUIDGeneratorBrowser: UUIDGeneratorBrowser, UUIDGeneratorNode: UUIDGeneratorNode, anagrams: anagrams, arrayToHtmlList: arrayToHtmlList, average: average, averageBy: averageBy, bottomVisible: bottomVisible, byteSize: byteSize, call: call, capitalize: capitalize, capitalizeEveryWord: capitalizeEveryWord, chainAsync: chainAsync, chunk: chunk, clampNumber: clampNumber, cleanObj: cleanObj, cloneRegExp: cloneRegExp, coalesce: coalesce, coalesceFactory: coalesceFactory, collectInto: collectInto, colorize: colorize, compact: compact, compose: compose, copyToClipboard: copyToClipboard, countBy: countBy, countOccurrences: countOccurrences, createElement: createElement, createEventHub: createEventHub, currentURL: currentURL, curry: curry, decapitalize: decapitalize, deepFlatten: deepFlatten, defer: defer, detectDeviceType: detectDeviceType, difference: difference, differenceWith: differenceWith, digitize: digitize, distance: distance, distinctValuesOfArray: distinctValuesOfArray, dropElements: dropElements, dropRight: dropRight, elementIsVisibleInViewport: elementIsVisibleInViewport, elo: elo, equals: equals, escapeHTML: escapeHTML, escapeRegExp: escapeRegExp, everyNth: everyNth, extendHex: extendHex, factorial: factorial, fibonacci: fibonacci, filterNonUnique: filterNonUnique, findLast: findLast, flatten: flatten, flip: flip, forEachRight: forEachRight, formatDuration: formatDuration, fromCamelCase: fromCamelCase, functionName: functionName, functions: functions, gcd: gcd, geometricProgression: geometricProgression, getDaysDiffBetweenDates: getDaysDiffBetweenDates, getScrollPosition: getScrollPosition, getStyle: getStyle, getType: getType, getURLParameters: getURLParameters, groupBy: groupBy, hammingDistance: hammingDistance, hasClass: hasClass, hasFlags: hasFlags, head: head, hexToRGB: hexToRGB, hide: hide, httpGet: httpGet, httpPost: httpPost, httpsRedirect: httpsRedirect, inRange: inRange, indexOfAll: indexOfAll, initial: initial, initialize2DArray: initialize2DArray, initializeArrayWithRange: initializeArrayWithRange, initializeArrayWithValues: initializeArrayWithValues, intersection: intersection, invertKeyValues: invertKeyValues, isAbsoluteURL: isAbsoluteURL, isArray: isArray, isArrayLike: isArrayLike, isBoolean: isBoolean, isDivisible: isDivisible, isEven: isEven, isFunction: isFunction, isLowerCase: isLowerCase, isNull: isNull, isNumber: isNumber, isObject: isObject, isPrime: isPrime, isPrimitive: isPrimitive, isPromiseLike: isPromiseLike, isSorted: isSorted, isString: isString, isSymbol: isSymbol, isTravisCI: isTravisCI, isUpperCase: isUpperCase, isValidJSON: isValidJSON, join: join, last: last, lcm: lcm, longestItem: longestItem, lowercaseKeys: lowercaseKeys, luhnCheck: luhnCheck, mapKeys: mapKeys, mapObject: mapObject, mapValues: mapValues, mask: mask, maxBy: maxBy, maxN: maxN, median: median, memoize: memoize, merge: merge, minBy: minBy, minN: minN, negate: negate, nthElement: nthElement, objectFromPairs: objectFromPairs, objectToPairs: objectToPairs, observeMutations: observeMutations, off: off, on: on, onUserInputChange: onUserInputChange, once: once, orderBy: orderBy, palindrome: palindrome, parseCookie: parseCookie, partition: partition, percentile: percentile, pick: pick, pipeFunctions: pipeFunctions, pluralize: pluralize, powerset: powerset, prettyBytes: prettyBytes, primes: primes, promisify: promisify, pull: pull, pullAtIndex: pullAtIndex, pullAtValue: pullAtValue, randomHexColorCode: randomHexColorCode, randomIntArrayInRange: randomIntArrayInRange, randomIntegerInRange: randomIntegerInRange, randomNumberInRange: randomNumberInRange, readFileLines: readFileLines, redirect: redirect, reducedFilter: reducedFilter, remove: remove, reverseString: reverseString, round: round, runAsync: runAsync, runPromisesInSeries: runPromisesInSeries, sample: sample, sampleSize: sampleSize, scrollToTop: scrollToTop, sdbm: sdbm, select: select, serializeCookie: serializeCookie, setStyle: setStyle, shallowClone: shallowClone, show: show, shuffle: shuffle, similarity: similarity, size: size, sleep: sleep, sortCharactersInString: sortCharactersInString, sortedIndex: sortedIndex, splitLines: splitLines, spreadOver: spreadOver, standardDeviation: standardDeviation, sum: sum, sumBy: sumBy, sumPower: sumPower, symmetricDifference: symmetricDifference, tail: tail, take: take, takeRight: takeRight, timeTaken: timeTaken, toCamelCase: toCamelCase, toDecimalMark: toDecimalMark, toKebabCase: toKebabCase, toOrdinalSuffix: toOrdinalSuffix, toSafeInteger: toSafeInteger, toSnakeCase: toSnakeCase, toggleClass: toggleClass, tomorrow: tomorrow, transform: transform, truncateString: truncateString, truthCheckCollection: truthCheckCollection, unescapeHTML: unescapeHTML, union: union, untildify: untildify, validateNumber: validateNumber, without: without, words: words, yesNo: yesNo, zip: zip, zipObject: zipObject };
 
 return imports;
 
diff --git a/dist/_30s.es5.min.js b/dist/_30s.es5.min.js
index 0bbb1bc13..fbe29289a 100644
--- a/dist/_30s.es5.min.js
+++ b/dist/_30s.es5.min.js
@@ -1 +1 @@
-(function(a,b){'object'==typeof exports&&'undefined'!=typeof module?module.exports=b():'function'==typeof define&&define.amd?define(b):a._30s=b()})(this,function(){'use strict';function a(a){return Array.isArray(a)?a:Array.from(a)}function b(a){return Array.isArray(a)?a:Array.from(a)}function c(a){if(Array.isArray(a)){for(var b=0,c=Array(a.length);b<a.length;b++)c[b]=a[b];return c}return Array.from(a)}function d(a){if(Array.isArray(a)){for(var b=0,c=Array(a.length);b<a.length;b++)c[b]=a[b];return c}return Array.from(a)}function e(a){if(Array.isArray(a)){for(var b=0,c=Array(a.length);b<a.length;b++)c[b]=a[b];return c}return Array.from(a)}function f(a){return Array.isArray(a)?a:Array.from(a)}function g(a){if(Array.isArray(a)){for(var b=0,c=Array(a.length);b<a.length;b++)c[b]=a[b];return c}return Array.from(a)}function i(a){if(Array.isArray(a)){for(var b=0,c=Array(a.length);b<a.length;b++)c[b]=a[b];return c}return Array.from(a)}function h(a){if(Array.isArray(a)){for(var 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non-iterable instance')}}(),N='function'==typeof Symbol&&'symbol'==typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&'function'==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?'symbol':typeof a},O='undefined'!=typeof require&&require('fs'),P='function'==typeof Symbol&&'symbol'==typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&'function'==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?'symbol':typeof a};return{JSONToFile:function(a,b){return E.writeFile(b+'.json',JSON.stringify(a,null,2))},RGBToHex:function(a,c,d){return((a<<16)+(c<<8)+d).toString(16).padStart(6,'0')},UUIDGeneratorBrowser:function(){return'10000000-1000-4000-8000-100000000000'.replace(/[018]/g,function(a){return(a^crypto.getRandomValues(new Uint8Array(1))[0]&15>>a/4).toString(16)})},UUIDGeneratorNode:function(){return'10000000-1000-4000-8000-100000000000'.replace(/[018]/g,function(a){return(a^F.randomBytes(1)[0]&15>>a/4).toString(16)})},anagrams:function a(b){return 2>=b.length?2===b.length?[b,b[1]+b[0]]:[b]:b.split('').reduce(function(c,d,e){return c.concat(a(b.slice(0,e)+b.slice(e+1)).map(function(a){return d+a}))},[])},arrayToHtmlList:function(a,b){return a.map(function(a){return document.querySelector('#'+b).innerHTML+='<li>'+a+'</li>'})},average:function(){for(var a=arguments.length,b=Array(a),c=0;c<a;c++)b[c]=arguments[c];return[].concat(b).reduce(function(a,b){return a+b},0)/b.length},averageBy:function(a,b){return a.map('function'==typeof b?b:function(a){return a[b]}).reduce(function(a,b){return a+b},0)/a.length},bottomVisible:function(){return document.documentElement.clientHeight+window.scrollY>=(document.documentElement.scrollHeight||document.documentElement.clientHeight)},byteSize:function(a){return new Blob([a]).size},call:function(a){for(var b=arguments.length,c=Array(1<b?b-1:0),d=1;d<b;d++)c[d-1]=arguments[d];return function(b){return b[a].apply(b,c)}},capitalize:function(b){var c=a(b),d=c[0],e=c.slice(1),f=1<arguments.length&&arguments[1]!==void 0&&arguments[1];return d.toUpperCase()+(f?e.join('').toLowerCase():e.join(''))},capitalizeEveryWord:function(a){return a.replace(/\b[a-z]/g,function(a){return a.toUpperCase()})},chainAsync:function(a){var b=0;(function c(){return a[b++](c)})()},chunk:function(a,b){return Array.from({length:D(a.length/b)},function(c,d){return a.slice(d*b,d*b+b)})},clampNumber:function(c,d,a){return C(B(c,C(d,a)),B(d,a))},cleanObj:function a(b){var c=1<arguments.length&&void 0!==arguments[1]?arguments[1]:[],d=arguments[2];return Object.keys(b).forEach(function(e){e===d?a(b[e],c,d):!c.includes(e)&&delete b[e]}),b},cloneRegExp:function(a){return new RegExp(a.source,a.flags)},coalesce:function(){for(var a=arguments.length,b=Array(a),c=0;c<a;c++)b[c]=arguments[c];return b.find(function(a){return![void 0,null].includes(a)})},coalesceFactory:function(a){return function(){for(var b=arguments.length,c=Array(b),d=0;d<b;d++)c[d]=arguments[d];return c.find(a)}},collectInto:function(a){return function(){for(var b=arguments.length,c=Array(b),d=0;d<b;d++)c[d]=arguments[d];return a(c)}},colorize:function(){for(var a=arguments.length,b=Array(a),c=0;c<a;c++)b[c]=arguments[c];return{black:'\x1B[30m'+b.join(' '),red:'\x1B[31m'+b.join(' '),green:'\x1B[32m'+b.join(' '),yellow:'\x1B[33m'+b.join(' '),blue:'\x1B[34m'+b.join(' '),magenta:'\x1B[35m'+b.join(' '),cyan:'\x1B[36m'+b.join(' '),white:'\x1B[37m'+b.join(' '),bgBlack:'\x1B[40m'+b.join(' ')+'\x1B[0m',bgRed:'\x1B[41m'+b.join(' ')+'\x1B[0m',bgGreen:'\x1B[42m'+b.join(' ')+'\x1B[0m',bgYellow:'\x1B[43m'+b.join(' ')+'\x1B[0m',bgBlue:'\x1B[44m'+b.join(' ')+'\x1B[0m',bgMagenta:'\x1B[45m'+b.join(' ')+'\x1B[0m',bgCyan:'\x1B[46m'+b.join(' ')+'\x1B[0m',bgWhite:'\x1B[47m'+b.join(' ')+'\x1B[0m'}},compact:function(a){return a.filter(Boolean)},compose:function(){for(var a=arguments.length,b=Array(a),c=0;c<a;c++)b[c]=arguments[c];return b.reduce(function(a,b){return function(){return a(b.apply(void 0,arguments))}})},copyToClipboard:function(a){var b=document.createElement('textarea');b.value=a,b.setAttribute('readonly',''),b.style.position='absolute',b.style.left='-9999px',document.body.appendChild(b);var c=!!(0<document.getSelection().rangeCount)&&document.getSelection().getRangeAt(0);b.select(),document.execCommand('copy'),document.body.removeChild(b),c&&(document.getSelection().removeAllRanges(),document.getSelection().addRange(c))},countBy:function(a,b){return a.map('function'==typeof b?b:function(a){return a[b]}).reduce(function(a,b){return a[b]=(a[b]||0)+1,a},{})},countOccurrences:function(a,b){return a.reduce(function(c,a){return a===b?c+1:c+0},0)},createElement:function(a){var b=document.createElement('div');return 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a=arguments.length,b=Array(a),c=0;c<a;c++)b[c]=arguments[c];return[].concat(b).reduce(function(a,b){return a+b},0)},sumBy:function(a,b){return a.map('function'==typeof b?b:function(a){return a[b]}).reduce(function(a,b){return a+b},0)},sumPower:function(a){var b=1<arguments.length&&arguments[1]!==void 0?arguments[1]:2,c=2<arguments.length&&arguments[2]!==void 0?arguments[2]:1;return Array(a+1-c).fill(0).map(function(a,d){return A(d+c,b)}).reduce(function(c,a){return c+a},0)},symmetricDifference:function(c,a){var b=new Set(c),d=new Set(a);return[].concat(u(c.filter(function(a){return!d.has(a)})),u(a.filter(function(a){return!b.has(a)})))},tail:function(a){return 1<a.length?a.slice(1):a},take:function(a){var b=1<arguments.length&&arguments[1]!==void 0?arguments[1]:1;return a.slice(0,b)},takeRight:function(a){var b=1<arguments.length&&arguments[1]!==void 0?arguments[1]:1;return a.slice(a.length-b,a.length)},timeTaken:function(a){console.time('timeTaken');var b=a();return console.timeEnd('timeTaken'),b},toCamelCase:function(a){var b=a&&a.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function(a){return a.slice(0,1).toUpperCase()+a.slice(1).toLowerCase()}).join('');return b.slice(0,1).toLowerCase()+b.slice(1)},toDecimalMark:function(a){return a.toLocaleString('en-US')},toKebabCase:function(a){return a&&a.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function(a){return a.toLowerCase()}).join('-')},toOrdinalSuffix:function(a){var b=parseInt(a),c=[b%10,b%100],d=['st','nd','rd','th'];return[1,2,3,4].includes(c[0])&&![11,12,13,14,15,16,17,18,19].includes(c[1])?b+d[c[0]-1]:b+d[3]},toSafeInteger:function(a){return x(C(B(a,Number.MAX_SAFE_INTEGER),Number.MIN_SAFE_INTEGER))},toSnakeCase:function(a){return a&&a.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function(a){return a.toLowerCase()}).join('_')},toggleClass:function(a,b){return a.classList.toggle(b)},tomorrow:function(){return new Date(new Date().getTime()+8.64e7).toISOString().split('T')[0]},transform:function(b,c,a){return Object.keys(b).reduce(function(d,a){return c(d,b[a],a,b)},a)},truncateString:function(a,b){return a.length>b?a.slice(0,3<b?b-3:b)+'...':a},truthCheckCollection:function(a,b){return a.every(function(a){return a[b]})},unescapeHTML:function(a){return a.replace(/&amp;|&lt;|&gt;|&#39;|&quot;/g,function(a){return{"&amp;":'&',"&lt;":'<',"&gt;":'>',"&#39;":'\'',"&quot;":'"'}[a]||a})},union:function(c,a){return Array.from(new Set([].concat(v(c),v(a))))},untildify:function(a){return a.replace(/^~($|\/|\\)/,('undefined'!=typeof require&&require('os').homedir())+'$1')},validateNumber:function(a){return!isNaN(parseFloat(a))&&isFinite(a)&&+a==a},without:function(a){for(var b=arguments.length,c=Array(1<b?b-1:0),d=1;d<b;d++)c[d-1]=arguments[d];return a.filter(function(a){return!c.includes(a)})},words:function(a){var b=1<arguments.length&&arguments[1]!==void 0?arguments[1]:/[^a-zA-Z-]+/;return a.split(b).filter(Boolean)},yesNo:function(a){var b=1<arguments.length&&arguments[1]!==void 0&&arguments[1];return!!/^(y|yes)$/i.test(a)||!/^(n|no)$/i.test(a)&&b},zip:function(){for(var a=arguments.length,b=Array(a),c=0;c<a;c++)b[c]=arguments[c];var d=C.apply(Math,w(b.map(function(a){return a.length})));return Array.from({length:d}).map(function(a,c){return Array.from({length:b.length},function(a,d){return b[d][c]})})},zipObject:function(a,b){return a.reduce(function(a,c,d){return a[c]=b[d],a},{})}}});
diff --git a/dist/_30s.esm.js b/dist/_30s.esm.js
index 4940f1bb3..4a4a45638 100644
--- a/dist/_30s.esm.js
+++ b/dist/_30s.esm.js
@@ -589,6 +589,25 @@ const objectFromPairs = arr => arr.reduce((a, v) => (a[v[0]] = v[1], a), {});
 
 const objectToPairs = obj => Object.keys(obj).map(k => [k, obj[k]]);
 
+const observeMutations = (element, callback, options) => {
+  const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));
+  observer.observe(
+    element,
+    Object.assign(
+      {
+        childList: true,
+        attributes: true,
+        attributeOldValue: true,
+        characterData: true,
+        characterDataOldValue: true,
+        subtree: true
+      },
+      options
+    )
+  );
+  return observer;
+};
+
 const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);
 
 const on = (el, evt, fn, opts = {}) => {
@@ -982,6 +1001,6 @@ const zip = (...arrays) => {
 const zipObject = (props, values) =>
   props.reduce((obj, prop, index) => (obj[prop] = values[index], obj), {});
 
-var imports = {JSONToFile,RGBToHex,UUIDGeneratorBrowser,UUIDGeneratorNode,anagrams,arrayToHtmlList,average,averageBy,bottomVisible,byteSize,call,capitalize,capitalizeEveryWord,chainAsync,chunk,clampNumber,cleanObj,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compose,copyToClipboard,countBy,countOccurrences,createElement,createEventHub,currentURL,curry,decapitalize,deepFlatten,defer,detectDeviceType,difference,differenceWith,digitize,distance,distinctValuesOfArray,dropElements,dropRight,elementIsVisibleInViewport,elo,equals,escapeHTML,escapeRegExp,everyNth,extendHex,factorial,fibonacci,filterNonUnique,findLast,flatten,flip,forEachRight,formatDuration,fromCamelCase,functionName,functions,gcd,geometricProgression,getDaysDiffBetweenDates,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,inRange,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithValues,intersection,invertKeyValues,isAbsoluteURL,isArray,isArrayLike,isBoolean,isDivisible,isEven,isFunction,isLowerCase,isNull,isNumber,isObject,isPrime,isPrimitive,isPromiseLike,isSorted,isString,isSymbol,isTravisCI,isUpperCase,isValidJSON,join,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapObject,mapValues,mask,maxBy,maxN,median,memoize,merge,minBy,minN,negate,nthElement,objectFromPairs,objectToPairs,off,on,onUserInputChange,once,orderBy,palindrome,parseCookie,partition,percentile,pick,pipeFunctions,pluralize,powerset,prettyBytes,primes,promisify,pull,pullAtIndex,pullAtValue,randomHexColorCode,randomIntArrayInRange,randomIntegerInRange,randomNumberInRange,readFileLines,redirect,reducedFilter,remove,reverseString,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,select,serializeCookie,setStyle,shallowClone,show,shuffle,similarity,size,sleep,sortCharactersInString,sortedIndex,splitLines,spreadOver,standardDeviation,sum,sumBy,sumPower,symmetricDifference,tail,take,takeRight,timeTaken,toCamelCase,toDecimalMark,toKebabCase,toOrdinalSuffix,toSafeInteger,toSnakeCase,toggleClass,tomorrow,transform,truncateString,truthCheckCollection,unescapeHTML,union,untildify,validateNumber,without,words,yesNo,zip,zipObject,}
+var imports = {JSONToFile,RGBToHex,UUIDGeneratorBrowser,UUIDGeneratorNode,anagrams,arrayToHtmlList,average,averageBy,bottomVisible,byteSize,call,capitalize,capitalizeEveryWord,chainAsync,chunk,clampNumber,cleanObj,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compose,copyToClipboard,countBy,countOccurrences,createElement,createEventHub,currentURL,curry,decapitalize,deepFlatten,defer,detectDeviceType,difference,differenceWith,digitize,distance,distinctValuesOfArray,dropElements,dropRight,elementIsVisibleInViewport,elo,equals,escapeHTML,escapeRegExp,everyNth,extendHex,factorial,fibonacci,filterNonUnique,findLast,flatten,flip,forEachRight,formatDuration,fromCamelCase,functionName,functions,gcd,geometricProgression,getDaysDiffBetweenDates,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,inRange,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithValues,intersection,invertKeyValues,isAbsoluteURL,isArray,isArrayLike,isBoolean,isDivisible,isEven,isFunction,isLowerCase,isNull,isNumber,isObject,isPrime,isPrimitive,isPromiseLike,isSorted,isString,isSymbol,isTravisCI,isUpperCase,isValidJSON,join,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapObject,mapValues,mask,maxBy,maxN,median,memoize,merge,minBy,minN,negate,nthElement,objectFromPairs,objectToPairs,observeMutations,off,on,onUserInputChange,once,orderBy,palindrome,parseCookie,partition,percentile,pick,pipeFunctions,pluralize,powerset,prettyBytes,primes,promisify,pull,pullAtIndex,pullAtValue,randomHexColorCode,randomIntArrayInRange,randomIntegerInRange,randomNumberInRange,readFileLines,redirect,reducedFilter,remove,reverseString,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,select,serializeCookie,setStyle,shallowClone,show,shuffle,similarity,size,sleep,sortCharactersInString,sortedIndex,splitLines,spreadOver,standardDeviation,sum,sumBy,sumPower,symmetricDifference,tail,take,takeRight,timeTaken,toCamelCase,toDecimalMark,toKebabCase,toOrdinalSuffix,toSafeInteger,toSnakeCase,toggleClass,tomorrow,transform,truncateString,truthCheckCollection,unescapeHTML,union,untildify,validateNumber,without,words,yesNo,zip,zipObject,}
 
 export default imports;
diff --git a/dist/_30s.js b/dist/_30s.js
index 90a6c5836..182c248d3 100644
--- a/dist/_30s.js
+++ b/dist/_30s.js
@@ -595,6 +595,25 @@ const objectFromPairs = arr => arr.reduce((a, v) => (a[v[0]] = v[1], a), {});
 
 const objectToPairs = obj => Object.keys(obj).map(k => [k, obj[k]]);
 
+const observeMutations = (element, callback, options) => {
+  const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));
+  observer.observe(
+    element,
+    Object.assign(
+      {
+        childList: true,
+        attributes: true,
+        attributeOldValue: true,
+        characterData: true,
+        characterDataOldValue: true,
+        subtree: true
+      },
+      options
+    )
+  );
+  return observer;
+};
+
 const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);
 
 const on = (el, evt, fn, opts = {}) => {
@@ -988,7 +1007,7 @@ const zip = (...arrays) => {
 const zipObject = (props, values) =>
   props.reduce((obj, prop, index) => (obj[prop] = values[index], obj), {});
 
-var imports = {JSONToFile,RGBToHex,UUIDGeneratorBrowser,UUIDGeneratorNode,anagrams,arrayToHtmlList,average,averageBy,bottomVisible,byteSize,call,capitalize,capitalizeEveryWord,chainAsync,chunk,clampNumber,cleanObj,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compose,copyToClipboard,countBy,countOccurrences,createElement,createEventHub,currentURL,curry,decapitalize,deepFlatten,defer,detectDeviceType,difference,differenceWith,digitize,distance,distinctValuesOfArray,dropElements,dropRight,elementIsVisibleInViewport,elo,equals,escapeHTML,escapeRegExp,everyNth,extendHex,factorial,fibonacci,filterNonUnique,findLast,flatten,flip,forEachRight,formatDuration,fromCamelCase,functionName,functions,gcd,geometricProgression,getDaysDiffBetweenDates,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,inRange,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithValues,intersection,invertKeyValues,isAbsoluteURL,isArray,isArrayLike,isBoolean,isDivisible,isEven,isFunction,isLowerCase,isNull,isNumber,isObject,isPrime,isPrimitive,isPromiseLike,isSorted,isString,isSymbol,isTravisCI,isUpperCase,isValidJSON,join,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapObject,mapValues,mask,maxBy,maxN,median,memoize,merge,minBy,minN,negate,nthElement,objectFromPairs,objectToPairs,off,on,onUserInputChange,once,orderBy,palindrome,parseCookie,partition,percentile,pick,pipeFunctions,pluralize,powerset,prettyBytes,primes,promisify,pull,pullAtIndex,pullAtValue,randomHexColorCode,randomIntArrayInRange,randomIntegerInRange,randomNumberInRange,readFileLines,redirect,reducedFilter,remove,reverseString,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,select,serializeCookie,setStyle,shallowClone,show,shuffle,similarity,size,sleep,sortCharactersInString,sortedIndex,splitLines,spreadOver,standardDeviation,sum,sumBy,sumPower,symmetricDifference,tail,take,takeRight,timeTaken,toCamelCase,toDecimalMark,toKebabCase,toOrdinalSuffix,toSafeInteger,toSnakeCase,toggleClass,tomorrow,transform,truncateString,truthCheckCollection,unescapeHTML,union,untildify,validateNumber,without,words,yesNo,zip,zipObject,}
+var imports = {JSONToFile,RGBToHex,UUIDGeneratorBrowser,UUIDGeneratorNode,anagrams,arrayToHtmlList,average,averageBy,bottomVisible,byteSize,call,capitalize,capitalizeEveryWord,chainAsync,chunk,clampNumber,cleanObj,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compose,copyToClipboard,countBy,countOccurrences,createElement,createEventHub,currentURL,curry,decapitalize,deepFlatten,defer,detectDeviceType,difference,differenceWith,digitize,distance,distinctValuesOfArray,dropElements,dropRight,elementIsVisibleInViewport,elo,equals,escapeHTML,escapeRegExp,everyNth,extendHex,factorial,fibonacci,filterNonUnique,findLast,flatten,flip,forEachRight,formatDuration,fromCamelCase,functionName,functions,gcd,geometricProgression,getDaysDiffBetweenDates,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,inRange,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithValues,intersection,invertKeyValues,isAbsoluteURL,isArray,isArrayLike,isBoolean,isDivisible,isEven,isFunction,isLowerCase,isNull,isNumber,isObject,isPrime,isPrimitive,isPromiseLike,isSorted,isString,isSymbol,isTravisCI,isUpperCase,isValidJSON,join,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapObject,mapValues,mask,maxBy,maxN,median,memoize,merge,minBy,minN,negate,nthElement,objectFromPairs,objectToPairs,observeMutations,off,on,onUserInputChange,once,orderBy,palindrome,parseCookie,partition,percentile,pick,pipeFunctions,pluralize,powerset,prettyBytes,primes,promisify,pull,pullAtIndex,pullAtValue,randomHexColorCode,randomIntArrayInRange,randomIntegerInRange,randomNumberInRange,readFileLines,redirect,reducedFilter,remove,reverseString,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,select,serializeCookie,setStyle,shallowClone,show,shuffle,similarity,size,sleep,sortCharactersInString,sortedIndex,splitLines,spreadOver,standardDeviation,sum,sumBy,sumPower,symmetricDifference,tail,take,takeRight,timeTaken,toCamelCase,toDecimalMark,toKebabCase,toOrdinalSuffix,toSafeInteger,toSnakeCase,toggleClass,tomorrow,transform,truncateString,truthCheckCollection,unescapeHTML,union,untildify,validateNumber,without,words,yesNo,zip,zipObject,}
 
 return imports;
 
diff --git a/dist/_30s.min.js b/dist/_30s.min.js
index 60cd437e3..4a9a366ef 100644
--- a/dist/_30s.min.js
+++ b/dist/_30s.min.js
@@ -1 +1 @@
-(function(a,b){'object'==typeof exports&&'undefined'!=typeof module?module.exports=b():'function'==typeof define&&define.amd?define(b):a._30s=b()})(this,function(){'use strict';var a=Math.round,b=Math.sqrt,c=Math.log,d=Math.floor,e=Math.min,f=Math.max,g=Math.ceil;const h='undefined'!=typeof require&&require('fs'),i='undefined'!=typeof require&&require('crypto'),j=(a)=>2>=a.length?2===a.length?[a,a[1]+a[0]]:[a]:a.split('').reduce((b,c,d)=>b.concat(j(a.slice(0,d)+a.slice(d+1)).map((a)=>c+a)),[]),k=(a,b=[],c)=>(Object.keys(a).forEach((d)=>{d===c?k(a[d],b,c):!b.includes(d)&&delete a[d]}),a),l=(a,b=a.length,...c)=>b<=c.length?a(...c):l.bind(null,a,b,...c),m=(a)=>[].concat(...a.map((a)=>Array.isArray(a)?m(a):a)),n=([...c],d=32,e)=>{const[f,a]=c,b=(a,b)=>1/(1+10**((b-a)/400)),g=(c,g)=>(e||c)+d*(g-b(g?f:a,g?a:f));if(2===c.length)return[g(f,1),g(a,0)];for(let a,b=0;b<c.length;b++)for(a=b;a<c.length-1;)[c[b],c[a+1]]=n([c[b],c[a+1]],d),a++;return c},o=(c,d)=>{if(c===d)return!0;if(c instanceof Date&&d instanceof Date)return c.getTime()===d.getTime();if(!c||!d||'object'!=typeof c&&'object'!=typeof d)return c===d;if(null===c||void 0===c||null===d||void 0===d)return!1;if(c.prototype!==d.prototype)return!1;let e=Object.keys(c);return!(e.length!==Object.keys(d).length)&&e.every((a)=>o(c[a],d[a]))},p=(a)=>0>a?(()=>{throw new TypeError('Negative numbers are not allowed!')})():1>=a?1:a*p(a-1),q=(a,b=1)=>1==b?a.reduce((b,a)=>b.concat(a),[]):a.reduce((c,a)=>c.concat(Array.isArray(a)?q(a,b-1):a),[]),r=(...a)=>{const c=(a,b)=>b?r(b,a%b):a;return[...a].reduce((d,a)=>c(d,a))},s='undefined'!=typeof require&&require('fs'),t=()=>{const a=document.documentElement.scrollTop||document.body.scrollTop;0<a&&(window.requestAnimationFrame(t),window.scrollTo(0,a-a/8))};return{JSONToFile:(a,b)=>h.writeFile(`${b}.json`,JSON.stringify(a,null,2)),RGBToHex:(a,c,d)=>((a<<16)+(c<<8)+d).toString(16).padStart(6,'0'),UUIDGeneratorBrowser:()=>'10000000-1000-4000-8000-100000000000'.replace(/[018]/g,(a)=>(a^crypto.getRandomValues(new Uint8Array(1))[0]&15>>a/4).toString(16)),UUIDGeneratorNode:()=>'10000000-1000-4000-8000-100000000000'.replace(/[018]/g,(a)=>(a^i.randomBytes(1)[0]&15>>a/4).toString(16)),anagrams:j,arrayToHtmlList:(a,b)=>a.map((a)=>document.querySelector('#'+b).innerHTML+=`<li>${a}</li>`),average:(...a)=>[...a].reduce((a,b)=>a+b,0)/a.length,averageBy:(a,b)=>a.map('function'==typeof b?b:(a)=>a[b]).reduce((a,b)=>a+b,0)/a.length,bottomVisible:()=>document.documentElement.clientHeight+window.scrollY>=(document.documentElement.scrollHeight||document.documentElement.clientHeight),byteSize:(a)=>new 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diff --git a/snippets_archive/README.md b/snippets_archive/README.md
index 8e92cc46b..541c6eb6a 100644
--- a/snippets_archive/README.md
+++ b/snippets_archive/README.md
@@ -6,6 +6,268 @@ These snippets, while useful and interesting, didn't quite make it into the repo
 
 ## Table of Contents
 
+* [`JSONToDate`](#jsontodate)
+* [`speechSynthesis`](#speechsynthesis)
+* [`binarySearch`](#binarysearch)
+* [`collatz`](#collatz)
+* [`countVowels`](#countvowels)
+* [`factors`](#factors)
+* [`fibonacciCountUntilNum`](#fibonaccicountuntilnum)
+* [`fibonacciUntilNum`](#fibonacciuntilnum)
+* [`httpDelete`](#httpdelete)
+* [`httpPut`](#httpput)
+* [`isArmstrongNumber`](#isarmstrongnumber)
+* [`quickSort`](#quicksort)
+* [`removeVowels`](#removevowels)
+* [`solveRPN`](#solverpn)
+* [`howManyTimes`](#howmanytimes)
+
+---
+
+### JSONToDate
+
+Converts a JSON object to a date.
+
+Use `Date()`, to convert dates in JSON format to readable format (`dd/mm/yyyy`).
+
+```js
+const JSONToDate = arr => {
+  const dt = new Date(parseInt(arr.toString().substr(6)));
+  return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+JSONToDate(/Date(1489525200000)/); // "14/3/2017"
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### speechSynthesis
+
+Performs speech synthesis (experimental).
+
+Use `SpeechSynthesisUtterance.voice` and `window.speechSynthesis.getVoices()` to convert a message to speech.
+Use `window.speechSynthesis.speak()` to play the message.
+
+Learn more about the [SpeechSynthesisUtterance interface of the Web Speech API](https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance).
+
+```js
+const speechSynthesis = message => {
+  const msg = new SpeechSynthesisUtterance(message);
+  msg.voice = window.speechSynthesis.getVoices()[0];
+  window.speechSynthesis.speak(msg);
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+speechSynthesis('Hello, World'); // // plays the message
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### binarySearch
+
+Use recursion. Similar to `Array.indexOf()` that finds the index of a value within an array. 
+The difference being this operation only works with sorted arrays which offers a major performance boost due to it's logarithmic nature when compared to a linear search or `Array.indexOf()`.
+
+Search a sorted array by repeatedly dividing the search interval in half. 
+Begin with an interval covering the whole array. 
+If the value of the search is less than the item in the middle of the interval, recurse into the lower half. Otherwise recurse into the upper half. 
+Repeatedly recurse until the value is found which is the mid or you've recursed to a point that is greater than the length which means the value doesn't exist and return `-1`.
+
+```js
+const binarySearch = (arr, val, start = 0, end = arr.length - 1) => {
+  if (start > end) return -1;
+  const mid = Math.floor((start + end) / 2);
+  if (arr[mid] > val) return binarySearch(arr, val, start, mid - 1);
+  if (arr[mid] < val) return binarySearch(arr, val, mid + 1, end);
+  return mid;
+}
+``` 
+
+<details>
+<summary>Examples</summary>
+
+```js
+binarySearch([1, 4, 6, 7, 12, 13, 15, 18, 19, 20, 22, 24], 6); // 2
+binarySearch([1, 4, 6, 7, 12, 13, 15, 18, 19, 20, 22, 24], 21); // -1
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### collatz
+
+Applies the Collatz algorithm.
+
+If `n` is even, return `n/2`. Otherwise, return `3n+1`.
+
+```js
+const collatz = n => (n % 2 == 0 ? n / 2 : 3 * n + 1);
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+collatz(8); // 4
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### countVowels
+
+Retuns `number` of vowels in provided string.
+
+Use a regular expression to count the number of vowels `(A, E, I, O, U)` in a `string`.
+
+```js
+const countVowels = str => (str.match(/[aeiou]/gi) || []).length;
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+countVowels('foobar'); // 3
+countVowels('gym'); // 0
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### factors
+
+Returns the array of factors of the given `num`. 
+If the second argument is set to `true` returns only the prime factors of `num`.
+If `num` is `1` or `0` returns an empty array.
+If `num` is less than `0` returns all the factors of `-int` together with their additive inverses.
+
+Use `Array.from()`, `Array.map()` and `Array.filter()` to find all the factors of `num`.
+If given `num` is negative, use `Array.reduce()` to add the additive inverses to the array.
+Return all results if `primes` is `false`, else determine and return only the prime factors using `isPrime` and `Array.filter()`.
+Omit the second argument, `primes`, to return prime and non-prime factors by default.
+
+**Note**:- _Negative numbers are not considered prime._
+
+```js
+const factors = (num, primes = false) => {
+  const isPrime = num => {
+    const boundary = Math.floor(Math.sqrt(num));
+    for (var i = 2; i <= boundary; i++) if (num % i === 0) return false;
+    return num >= 2;
+  };
+  const isNeg = num < 0;
+  num = isNeg ? -num : num;
+  let array = Array.from({ length: num - 1 })
+    .map((val, i) => (num % (i + 2) === 0 ? i + 2 : false))
+    .filter(val => val);
+  if (isNeg)
+    array = array.reduce((acc, val) => {
+      acc.push(val);
+      acc.push(-val);
+      return acc;
+    }, []);
+  return primes ? array.filter(isPrime) : array;
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+factors(12); // [2,3,4,6,12]
+factors(12, true); // [2,3]
+factors(-12); // [2, -2, 3, -3, 4, -4, 6, -6, 12, -12]
+factors(-12, true); // [2,3]
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### fibonacciCountUntilNum
+
+Returns the number of fibonnacci numbers up to `num`(`0` and `num` inclusive).
+
+Use a mathematical formula to calculate the number of fibonacci numbers until `num`.
+
+```js
+const fibonacciCountUntilNum = num =>
+  Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+fibonacciCountUntilNum(10); // 7
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### fibonacciUntilNum
+
+Generates an array, containing the Fibonacci sequence, up until the nth term.
+
+Create an empty array of the specific length, initializing the first two values (`0` and `1`).
+Use `Array.reduce()` to add values into the array, using the sum of the last two values, except for the first two.
+Uses a mathematical formula to calculate the length of the array required.
+
+```js
+const fibonacciUntilNum = num => {
+  let n = Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));
+  return Array.from({ length: n }).reduce(
+    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
+    []
+  );
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+fibonacciUntilNum(10); // [ 0, 1, 1, 2, 3, 5, 8 ]
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+![Logo](/logo.png)
+
+# Snippets Archive
+
+These snippets, while useful and interesting, didn't quite make it into the repository due to either having very specific use-cases or being outdated. However we felt like they might still be useful to some readers, so here they are.
+
+## Table of Contents
+
 * [`JSONToDate.md`](#jsontodate.md)
 * [`speechSynthesis.md`](#speechsynthesis.md)
 * [`binarySearch.md`](#binarysearch.md)
@@ -1795,6 +2057,258 @@ solveRPN('2 3 ^'); // 8
 <br>[⬆ Back to top](#table-of-contents)
 
 
+### howManyTimes
+
+Returns the number of times `num` can be divided by `divisor` (integer or fractional) without getting a fractional answer.
+Works for both negative and positive integers.
+
+If `divisor` is `-1` or `1` return `Infinity`.
+If `divisor` is `-0` or `0` return `0`.
+Otherwise, keep dividing `num` with `divisor` and incrementing `i`, while the result is an integer.
+Return the number of times the loop was executed, `i`.
+
+```js
+const howManyTimes = (num, divisor) => {
+  if (divisor === 1 || divisor === -1) return Infinity;
+  if (divisor === 0) return 0;
+  let i = 0;
+  while (Number.isInteger(num / divisor)) {
+    i++;
+    num = num / divisor;
+  }
+  return i;
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+<details>
+<summary>Examples</summary>
+
+```js
+howManyTimes(100, 2); // 2
+howManyTimes(100, 2.5); // 2
+howManyTimes(100, 0); // 0
+howManyTimes(100, -1); // Infinity
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### httpDelete
+
+Makes a `DELETE` request to the passed URL.
+
+Use `XMLHttpRequest` web api to make a `delete` request to the given `url`.
+Handle the `onload` event, by running the provided `callback` function.
+Handle the `onerror` event, by running the provided `err` function.
+Omit the third argument, `err` to log the request to the console's error stream by default.
+
+```js
+const httpDelete = (url, callback, err = console.error) => {
+  const request = new XMLHttpRequest();
+  request.open("DELETE", url, true);
+  request.onload = () => callback(request);
+  request.onerror = () => err(request);
+  request.send();
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+httpDelete('https://website.com/users/123', request => {
+  console.log(request.responseText);
+}); // 'Deletes a user from the database'
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### httpPut
+
+Makes a `PUT` request to the passed URL.
+
+Use `XMLHttpRequest` web api to make a `put` request to the given `url`.
+Set the value of an `HTTP` request header with `setRequestHeader` method.
+Handle the `onload` event, by running the provided `callback` function.
+Handle the `onerror` event, by running the provided `err` function.
+Omit the last argument, `err` to log the request to the console's error stream by default.
+
+```js
+const httpPut = (url, data, callback, err = console.error) => {
+    const request = new XMLHttpRequest();
+    request.open("PUT", url, true);
+    request.setRequestHeader('Content-type','application/json; charset=utf-8');
+    request.onload = () => callback(request);
+    request.onerror = () => err(request);
+    request.send(data);
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+const password = "fooBaz";
+const data = JSON.stringify(password);
+httpPut('https://website.com/users/123', data, request => {
+  console.log(request.responseText);
+}); // 'Updates a user's password in database'
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### isArmstrongNumber
+
+Checks if the given number is an Armstrong number or not.
+
+Convert the given number into an array of digits. Use the exponent operator (`**`) to get the appropriate power for each digit and sum them up. If the sum is equal to the number itself, return `true` otherwise `false`.
+
+```js
+const isArmstrongNumber = digits =>
+  (arr => arr.reduce((a, d) => a + parseInt(d) ** arr.length, 0) == digits)(
+    (digits + '').split('')
+  );
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+isArmstrongNumber(1634); // true
+isArmstrongNumber(56); // false
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### quickSort
+
+QuickSort an Array (ascending sort by default).
+
+Use recursion. 
+Use `Array.filter` and spread operator (`...`) to create an array that all elements with values less than the pivot come before the pivot, and all elements with values greater than the pivot come after it. 
+If the parameter `desc` is truthy, return array sorts in descending order.
+
+```js
+const quickSort = ([n, ...nums], desc) =>
+  isNaN(n)
+    ? []
+    : [
+        ...quickSort(nums.filter(v => (desc ? v > n : v <= n)), desc),
+        n,
+        ...quickSort(nums.filter(v => (!desc ? v > n : v <= n)), desc)
+      ];
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+quickSort([4, 1, 3, 2]); // [1,2,3,4]
+quickSort([4, 1, 3, 2], true); // [4,3,2,1]
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### removeVowels
+
+Returns all the vowels in a `str` replaced by `repl`.
+
+Use `String.replace()` with a regexp to replace all vowels in `str`.
+Omot `repl` to use a default value of `''`.
+
+```js
+const removeVowels = (str, repl = '') => str.replace(/[aeiou]/gi,repl);
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+removeVowels("foobAr"); // "fbr"
+removeVowels("foobAr","*"); // "f**b*r"
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
+### solveRPN
+
+Solves the given mathematical expression in [reverse polish notation](https://en.wikipedia.org/wiki/Reverse_Polish_notation).
+Throws appropriate errors if there are unrecognized symbols or the expression is wrong. The valid operators are :- `+`,`-`,`*`,`/`,`^`,`**` (`^`&`**` are the exponential symbols and are same). This snippet does not supports any unary operators.
+
+Use a dictionary, `OPERATORS` to specify each operator's matching mathematical operation.
+Use `String.replace()` with a regular expression to replace `^` with `**`, `String.split()` to tokenize the string and `Array.filter()` to remove empty tokens.
+Use `Array.forEach()` to parse each `symbol`, evaluate it as a numeric value or operator and solve the mathematical expression.
+Numeric values are converted to floating point numbers and pushed to a `stack`, while operators are evaluated using the `OPERATORS` dictionary and pop elements from the `stack` to apply operations.
+
+```js
+const solveRPN = rpn => {
+  const OPERATORS = {
+    '*': (a, b) => a * b,
+    '+': (a, b) => a + b,
+    '-': (a, b) => a - b,
+    '/': (a, b) => a / b,
+    '**': (a, b) => a ** b
+  };
+  const [stack, solve] = [
+    [],
+    rpn
+      .replace(/\^/g, '**')
+      .split(/\s+/g)
+      .filter(el => !/\s+/.test(el) && el !== '')
+  ];
+  solve.forEach(symbol => {
+    if (!isNaN(parseFloat(symbol)) && isFinite(symbol)) {
+      stack.push(symbol);
+    } else if (Object.keys(OPERATORS).includes(symbol)) {
+      const [a, b] = [stack.pop(), stack.pop()];
+      stack.push(OPERATORS[symbol](parseFloat(b), parseFloat(a)));
+    } else {
+      throw `${symbol} is not a recognized symbol`;
+    }
+  });
+  if (stack.length === 1) return stack.pop();
+  else throw `${rpn} is not a proper RPN. Please check it and try again`;
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+solveRPN('15 7 1 1 + - / 3 * 2 1 1 + + -'); // 5
+solveRPN('2 3 ^'); // 8
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
 ### howManyTimes
 
 Returns the number of times `num` can be divided by `divisor` (integer or fractional) without getting a fractional answer.
diff --git a/test/observeMutations/observeMutations.js b/test/observeMutations/observeMutations.js
new file mode 100644
index 000000000..15a462fac
--- /dev/null
+++ b/test/observeMutations/observeMutations.js
@@ -0,0 +1,18 @@
+module.exports = observeMutations = (element, callback, options) => {
+const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));
+observer.observe(
+element,
+Object.assign(
+{
+childList: true,
+attributes: true,
+attributeOldValue: true,
+characterData: true,
+characterDataOldValue: true,
+subtree: true
+},
+options
+)
+);
+return observer;
+};
\ No newline at end of file
diff --git a/test/observeMutations/observeMutations.test.js b/test/observeMutations/observeMutations.test.js
new file mode 100644
index 000000000..eca8ff0d4
--- /dev/null
+++ b/test/observeMutations/observeMutations.test.js
@@ -0,0 +1,13 @@
+const test = require('tape');
+const observeMutations = require('./observeMutations.js');
+
+test('Testing observeMutations', (t) => {
+	//For more information on all the methods supported by tape
+	//Please go to https://github.com/substack/tape
+	t.true(typeof observeMutations === 'function', 'observeMutations is a Function');
+	//t.deepEqual(observeMutations(args..), 'Expected');
+	//t.equal(observeMutations(args..), 'Expected');
+	//t.false(observeMutations(args..), 'Expected');
+	//t.throws(observeMutations(args..), 'Expected');
+	t.end();
+});
\ No newline at end of file
diff --git a/test/testlog b/test/testlog
index 42b59cf00..558b0fba4 100644
--- a/test/testlog
+++ b/test/testlog
@@ -1,4 +1,4 @@
-Test log for: Tue Jan 16 2018 13:20:30 GMT+0000 (UTC)
+Test log for: Tue Jan 16 2018 14:20:20 GMT+0000 (UTC)
 
 > 30-seconds-of-code@0.0.1 test /home/travis/build/Chalarangelo/30-seconds-of-code
 > tape test/**/*.test.js | tap-spec
@@ -734,6 +734,10 @@ Test log for: Tue Jan 16 2018 13:20:30 GMT+0000 (UTC)
     ✔ objectToPairs is a Function
     ✔ Creates an array of key-value pair arrays from an object.
 
+  Testing observeMutations
+
+    ✔ observeMutations is a Function
+
   Testing off
 
     ✔ off is a Function
@@ -1142,8 +1146,8 @@ Test log for: Tue Jan 16 2018 13:20:30 GMT+0000 (UTC)
     ✔ Array was zipped to object
 
 
-  total:     489
-  passing:   489
-  duration:  512ms
+  total:     490
+  passing:   490
+  duration:  270ms