Add createDirIfNotExists snippet

snippets/createDirIfNotExists.md

@@ -0,0 +1,14 @@
+### createDirIfNotExists
+
+Creates a directory, if it does not exist.
+
+Use `fs.existsSync()` to check if the directory exists, `fs.mkdirSync()` to create it.
+
+```js
+const fs = require('fs');
+const createDirIfNotExists = dir => !fs.existsSync(dir) ? fs.mkdirSync(dir) : undefined;
+```
+
+```js
+createDirIfNotExists('test'); // creates the directory 'test', if it doesn't exist
+```

tag_database

@@ -38,6 +38,7 @@ copyToClipboard:browser,string,advanced
 countBy:array,object,intermediate
 counter:browser,advanced
 countOccurrences:array,intermediate
+createDirIfNotExists:node,beginner
 createElement:browser,utility,beginner
 createEventHub:browser,event,advanced
 CSVToArray:string,array,utility,intermediate

test/_30s.js

@@ -1,53 +1,6 @@
 const fs = typeof require !== "undefined" && require('fs');
 const crypto = typeof require !== "undefined" && require('crypto');
 
-const CSVToArray = (data, delimiter = ',', omitFirstRow = false) =>
-  data
-    .slice(omitFirstRow ? data.indexOf('\n') + 1 : 0)
-    .split('\n')
-    .map(v => v.split(delimiter));
-const CSVToJSON = (data, delimiter = ',') => {
-  const titles = data.slice(0, data.indexOf('\n')).split(delimiter);
-  return data
-    .slice(data.indexOf('\n') + 1)
-    .split('\n')
-    .map(v => {
-      const values = v.split(delimiter);
-      return titles.reduce((obj, title, index) => ((obj[title] = values[index]), obj), {});
-    });
-};
-
-const JSONToFile = (obj, filename) =>
-  fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2));
-const JSONtoCSV = (arr, columns, delimiter = ',') =>
-  [
-    columns.join(delimiter),
-    ...arr.map(obj =>
-      columns.reduce(
-        (acc, key) => `${acc}${!acc.length ? '' : delimiter}"${!obj[key] ? '' : obj[key]}"`,
-        ''
-      )
-    )
-  ].join('\n');
-const RGBToHex = (r, g, b) => ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');
-const URLJoin = (...args) =>
-  args
-    .join('/')
-    .replace(/[\/]+/g, '/')
-    .replace(/^(.+):\//, '$1://')
-    .replace(/^file:/, 'file:/')
-    .replace(/\/(\?|&|#[^!])/g, '$1')
-    .replace(/\?/g, '&')
-    .replace('&', '?');
-const UUIDGeneratorBrowser = () =>
-  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
-    (c ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))).toString(16)
-  );
-
-const UUIDGeneratorNode = () =>
-  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
-    (c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)
-  );
 
 const all = (arr, fn = Boolean) => arr.every(fn);
 
@@ -166,7 +119,6 @@ const countBy = (arr, fn) =>
   bgGreen: `\x1b[42m${args.join(' ')}\x1b[0m`,
   bgYellow: `\x1b[43m${args.join(' ')}\x1b[0m`,
   bgBlue: `\x1b[44m${args.join(' ')}\x1b[0m`,
-const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);
   bgMagenta: `\x1b[45m${args.join(' ')}\x1b[0m`,
   bgCyan: `\x1b[46m${args.join(' ')}\x1b[0m`,
   bgWhite: `\x1b[47m${args.join(' ')}\x1b[0m`
@@ -178,6 +130,9 @@ const counter = (selector, start, end, step = 1, duration = 2000) => {
 
 const composeRight = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));
 
+const converge = (converger, fns) => (...args) => converger(...fns.map(fn => fn.apply(null, args)));
+
+const copyToClipboard = str => {
   const el = document.createElement('textarea');
   el.value = str;
   el.setAttribute('readonly', '');
@@ -197,6 +152,21 @@ const createEventHub = () => ({
 
 const countBy = (arr, fn) =>
   arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => {
+    acc[val] = (acc[val] || 0) + 1;
+    return acc;
+  }, {});
+
+const counter = (selector, start, end, step = 1, duration = 2000) => {
+  let current = start,
+    _step = (end - start) * step < 0 ? -step : step,
+    timer = setInterval(() => {
+      current += _step;
+      document.querySelector(selector).innerHTML = current;
+      if (current >= end) document.querySelector(selector).innerHTML = end;
+      if (current >= end) clearInterval(timer);
+    }, Math.abs(Math.floor(duration / (end - start))));
+  return timer;
+};
 
 const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);
 
@@ -373,11 +343,6 @@ const forEachRight = (arr, callback) =>
   if (a === b) return true;
   if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();
   if (!a || !b || (typeof a !== 'object' && typeof b !== 'object')) return a === b;
-const forOwn = (obj, fn) => Object.keys(obj).forEach(key => fn(obj[key], key, obj));
-const forOwnRight = (obj, fn) =>
-  Object.keys(obj)
-    .reverse()
-    .forEach(key => fn(obj[key], key, obj));
   if (a === null || a === undefined || b === null || b === undefined) return false;
   if (a.prototype !== b.prototype) return false;
   let keys = Object.keys(a);
@@ -392,6 +357,11 @@ const formatDuration = ms => {
       ({
         '&': '&amp;',
         '<': '&lt;',
+        '>': '&gt;',
+        "'": '&#39;',
+        '"': '&quot;'
+      }[tag] || tag)
+  );
 
 const escapeRegExp = str => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
 
@@ -521,10 +491,6 @@ const hz = (fn, iterations = 100) => {
   (dateFinal - dateInitial) / (1000 * 3600 * 24);
 
 const getImages = (el, includeDuplicates = false) => {
-const inRange = (n, start, end = null) => {
-  if (end && start > end) [end, start] = [start, end];
-  return end == null ? n >= 0 && n < start : n >= start && n < end;
-};
   const images = [...el.getElementsByTagName('img')].map(img => img.getAttribute('src'));
   return includeDuplicates ? images : [...new Set(images)];
 };
@@ -541,6 +507,10 @@ const initializeNDArray = (val, ...args) =>
 const getScrollPosition = (el = window) => ({
   x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
   y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
+});
+
+const getStyle = (el, ruleName) => getComputedStyle(el)[ruleName];
+
 const getType = v =>
   v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();
 
@@ -652,6 +622,19 @@ const join = (arr, separator = ',', end = separator) =>
 
 const initializeArrayWithRangeRight = (end, start = 0, step = 1) =>
   Array.from({ length: Math.ceil((end + 1 - start) / step) }).map(
+    (v, i, arr) => (arr.length - i - 1) * step + start
+  );
+
+const initializeArrayWithValues = (n, val = 0) => Array(n).fill(val);
+
+const initializeNDArray = (val, ...args) =>
+  args.length === 0
+    ? val
+    : Array.from({ length: args[0] }).map(() => initializeNDArray(val, ...args.slice(1)));
+
+const inRange = (n, start, end = null) => {
+  if (end && start > end) [end, start] = [start, end];
+  return end == null ? n >= 0 && n < start : n >= start && n < end;
 };
 
 const insertAfter = (el, htmlString) => el.insertAdjacentHTML('afterend', htmlString);
@@ -784,6 +767,14 @@ const on = (el, evt, fn, opts = {}) => {
 const isValidJSON = str => {
   try {
     JSON.parse(str);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
+const isWritableStream = val =>
+  val !== null &&
   typeof val === 'object' &&
   typeof val.pipe === 'function' &&
   typeof val._write === 'function' &&
@@ -798,14 +789,6 @@ const onUserInputChange = callback => {
           ? acc + val
           : acc + val + separator,
     ''
-const once = fn => {
-  let called = false;
-  return function(...args) {
-    if (called) return;
-    called = true;
-    return fn.apply(this, args);
-  };
-};
   );
 
 const JSONtoCSV = (arr, columns, delimiter = ',') =>
@@ -965,10 +948,6 @@ const recordAnimationFrames = (callback, autoStart = true) => {
         characterData: true,
         characterDataOldValue: true,
         subtree: true
-const reduceSuccessive = (arr, fn, acc) =>
-  arr.reduce((res, val, i, arr) => (res.push(fn(res.slice(-1)[0], val, i, arr)), res), [acc]);
-const reduceWhich = (arr, comparator = (a, b) => a - b) =>
-  arr.reduce((a, b) => (comparator(a, b) >= 0 ? b : a));
       },
       options
     )
@@ -976,6 +955,10 @@ const reducedFilter = (data, keys, fn) =>
   return observer;
 };
 
+const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);
+
+const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];
+
 const omit = (obj, arr) =>
   Object.keys(obj)
     .filter(k => !arr.includes(k))
@@ -994,6 +977,7 @@ const renameKeys = (keysMap, obj) =>
 
 const once = fn => {
   let called = false;
+  return function(...args) {
     if (called) return;
     called = true;
     return fn.apply(this, args);
@@ -1168,16 +1152,16 @@ const throttle = (fn, wait) => {
   return '#' + n.slice(0, 6);
 };
 
+const randomIntArrayInRange = (min, max, n = 1) =>
+  Array.from({ length: n }, () => Math.floor(Math.random() * (max - min + 1)) + min);
+
+const randomIntegerInRange = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;
 
 const randomNumberInRange = (min, max) => Math.random() * (max - min) + min;
 
 
 const readFileLines = filename =>
   fs
-const times = (n, fn, context = undefined) => {
-  let i = 0;
-  while (fn.call(context, i) !== false && ++i < n) {}
-};
     .readFileSync(filename)
     .toString('UTF8')
     .split('\n');
@@ -1190,6 +1174,7 @@ const toCamelCase = str => {
   const stop = () => {
     running = false;
     cancelAnimationFrame(raf);
+  };
   const start = () => {
     running = true;
     run();
@@ -1202,6 +1187,14 @@ const toKebabCase = str =>
   };
   if (autoStart) start();
   return { start, stop };
+};
+
+const redirect = (url, asLink = true) =>
+  asLink ? (window.location.href = url) : window.location.replace(url);
+
+const reducedFilter = (data, keys, fn) =>
+  data.filter(fn).map(el =>
+    keys.reduce((acc, key) => {
       acc[key] = el[key];
       return acc;
     }, {})
@@ -1225,15 +1218,6 @@ const toTitleCase = str =>
 
 const removeNonASCII = str => str.replace(/[^\x20-\x7E]/g, '');
 
-const toggleClass = (el, className) => el.classList.toggle(className);
-const tomorrow = (long = false) => {
-  let t = new Date();
-  t.setDate(t.getDate() + 1);
-  const ret = `${t.getFullYear()}-${String(t.getMonth() + 1).padStart(2, '0')}-${String(
-    t.getDate()
-  ).padStart(2, '0')}`;
-  return !long ? ret : `${ret}T00:00:00`;
-};
 const renameKeys = (keysMap, obj) =>
   Object.keys(obj).reduce(
     (acc, key) => ({
@@ -1318,6 +1302,24 @@ const unzipWith = (arr, fn) =>
   return arr;
 };
 
+const similarity = (arr, values) => arr.filter(v => values.includes(v));
+
+const size = val =>
+  Array.isArray(val)
+    ? val.length
+    : val && typeof val === 'object'
+      ? val.size || val.length || Object.keys(val).length
+      : typeof val === 'string'
+        ? new Blob([val]).size
+        : 0;
+
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+const smoothScroll = element =>
+  document.querySelector(element).scrollIntoView({
+    behavior: 'smooth'
+  });
+
 const sortCharactersInString = str => [...str].sort((a, b) => a.localeCompare(b)).join('');
 
 const sortedIndex = (arr, n) => {
@@ -1340,10 +1342,6 @@ const zipWith = (...array) => {
 };
 
 const sortedLastIndexBy = (arr, n, fn) => {
-const JSONToDate = arr => {
-  const dt = new Date(parseInt(arr.toString().substr(6)));
-  return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;
-};
   const isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);
   const val = fn(n);
   const index = arr
@@ -1434,6 +1432,10 @@ const isSimilar = (pattern, str) =>
       fn.apply(context, args);
       lastTime = Date.now();
       inThrottle = true;
+    } else {
+      clearTimeout(lastFn);
+      lastFn = setTimeout(function() {
+        if (Date.now() - lastTime >= wait) {
           fn.apply(context, args);
           lastTime = Date.now();
         }
@@ -1506,4 +1508,4 @@ const speechSynthesis = message => {
 };
 
 const toSafeInteger = num =>
-module.exports = {CSVToArray,CSVToJSON,JSONToFile,JSONtoCSV,RGBToHex,URLJoin,UUIDGeneratorBrowser,UUIDGeneratorNode,all,allEqual,any,approximatelyEqual,arrayToCSV,arrayToHtmlList,ary,atob,attempt,average,averageBy,bifurcate,bifurcateBy,bind,bindAll,bindKey,binomialCoefficient,bottomVisible,btoa,byteSize,call,capitalize,capitalizeEveryWord,castArray,chainAsync,chunk,clampNumber,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compose,composeRight,converge,copyToClipboard,countBy,countOccurrences,counter,createElement,createEventHub,currentURL,curry,dayOfYear,debounce,decapitalize,deepClone,deepFlatten,deepFreeze,deepMapKeys,defaults,defer,degreesToRads,delay,detectDeviceType,difference,differenceBy,differenceWith,dig,digitize,distance,drop,dropRight,dropRightWhile,dropWhile,elementContains,elementIsVisibleInViewport,elo,equals,escapeHTML,escapeRegExp,everyNth,extendHex,factorial,fibonacci,filterFalsy,filterNonUnique,filterNonUniqueBy,findKey,findLast,findLastIndex,findLastKey,flatten,flattenObject,flip,forEachRight,forOwn,forOwnRight,formatDuration,fromCamelCase,functionName,functions,gcd,geometricProgression,get,getColonTimeFromDate,getDaysDiffBetweenDates,getImages,getMeridiemSuffixOfInteger,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,hashBrowser,hashNode,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,hz,inRange,indentString,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithRangeRight,initializeArrayWithValues,initializeNDArray,insertAfter,insertBefore,intersection,intersectionBy,intersectionWith,invertKeyValues,is,isAbsoluteURL,isAfterDate,isAnagram,isArrayLike,isBeforeDate,isBoolean,isBrowser,isBrowserTabFocused,isDivisible,isDuplexStream,isEmpty,isEven,isFunction,isLowerCase,isNegativeZero,isNil,isNull,isNumber,isObject,isObjectLike,isPlainObject,isPrime,isPrimitive,isPromiseLike,isReadableStream,isSameDate,isSorted,isStream,isString,isSymbol,isTravisCI,isUndefined,isUpperCase,isValidJSON,isWritableStream,join,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapObject,mapString,mapValues,mask,matches,matchesWith,maxBy,maxDate,maxN,median,memoize,merge,midpoint,minBy,minDate,minN,mostPerformant,negate,nest,nodeListToArray,none,nthArg,nthElement,objectFromPairs,objectToPairs,observeMutations,off,offset,omit,omitBy,on,onUserInputChange,once,orderBy,over,overArgs,pad,palindrome,parseCookie,partial,partialRight,partition,percentile,permutations,pick,pickBy,pipeAsyncFunctions,pipeFunctions,pluralize,powerset,prefix,prettyBytes,primes,promisify,pull,pullAtIndex,pullAtValue,pullBy,radsToDegrees,randomHexColorCode,randomIntArrayInRange,randomIntegerInRange,randomNumberInRange,readFileLines,rearg,recordAnimationFrames,redirect,reduceSuccessive,reduceWhich,reducedFilter,reject,remove,removeNonASCII,renameKeys,reverseString,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,serializeCookie,setStyle,shallowClone,shank,show,shuffle,similarity,size,sleep,smoothScroll,sortCharactersInString,sortedIndex,sortedIndexBy,sortedLastIndex,sortedLastIndexBy,splitLines,spreadOver,stableSort,standardDeviation,stringPermutations,stripHTMLTags,sum,sumBy,sumPower,symmetricDifference,symmetricDifferenceBy,symmetricDifferenceWith,tail,take,takeRight,takeRightWhile,takeWhile,throttle,timeTaken,times,toCamelCase,toCurrency,toDecimalMark,toHash,toKebabCase,toOrdinalSuffix,toSafeInteger,toSnakeCase,toTitleCase,toggleClass,tomorrow,transform,triggerEvent,truncateString,truthCheckCollection,unary,uncurry,unescapeHTML,unflattenObject,unfold,union,unionBy,unionWith,uniqueElements,uniqueElementsBy,uniqueElementsByRight,uniqueSymmetricDifference,untildify,unzip,unzipWith,validateNumber,when,without,words,xProd,yesNo,zip,zipObject,zipWith,JSONToDate,binarySearch,celsiusToFahrenheit,cleanObj,collatz,countVowels,factors,fahrenheitToCelsius,fibonacciCountUntilNum,fibonacciUntilNum,heronArea,howManyTimes,httpDelete,httpPut,isArmstrongNumber,isSimilar,kmphToMph,levenshteinDistance,mphToKmph,pipeLog,quickSort,removeVowels,solveRPN,speechSynthesis,squareSum}
+  Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));

test/createDirIfNotExists.js

@@ -0,0 +1,6 @@
+const expect = require('expect');
+const {createDirIfNotExists} = require('./_30s.js');
+
+test('createDirIfNotExists is a Function', () => {
+  expect(createDirIfNotExists).toBeInstanceOf(Function);
+});