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30secondsofcode
2020-01-03 13:37:17 +00:00
parent 27ecf5fd86
commit a88380728b
11 changed files with 202 additions and 86 deletions
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40
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"text": "Returns the most frequent element in an array.\n\nUse `Array.prototype.reduce()` to map unique values to an object's keys, adding to existing keys every time the same value is encountered.\nUse `Object.entries()` on the result in combination with `Array.prototype.reduce()` to get the most frequent value in the array.\n\n",
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@ -2498,6 +2498,31 @@
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{
"id": "frequencies",
"title": "frequencies",
"type": "snippet",
"attributes": {
"fileName": "frequencies.md",
"text": "Returns an object with the unique values of an array as keys and their frequencies as the values.\n\nUse `Array.prototype.reduce()` to map unique values to an object's keys, adding to existing keys every time the same value is encountered.\n\n",
"codeBlocks": {
"es6": "const frequencies = arr =>\n arr.reduce((a, v) => {\n a[v] = a[v] ? a[v] + 1 : 1;\n return a;\n }, {});",
"es5": "var frequencies = function frequencies(arr) {\n return arr.reduce(function (a, v) {\n a[v] = a[v] ? a[v] + 1 : 1;\n return a;\n }, {});\n};",
"example": "frequencies(['a', 'b', 'a', 'c', 'a', 'a', 'b']); // { a: 4, b: 2, c: 1 }"
},
"tags": [
"array",
"intermediate"
]
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@ -2746,8 +2771,8 @@
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"title": "mostFrequent",
"type": "snippet",
"attributes": {
"fileName": "mostFrequent.md",
"text": "Returns the most frequent element in an array.\n\nUse `Array.prototype.reduce()` to map unique values to an object's keys, adding to existing keys every time the same value is encountered.\nUse `Object.entries()` on the result in combination with `Array.prototype.reduce()` to get the most frequent value in the array.\n\n",
"codeBlocks": {
"es6": "const mostFrequent = arr =>\n Object.entries(\n arr.reduce((a, v) => {\n a[v] = a[v] ? a[v] + 1 : 1;\n return a;\n }, {})\n ).reduce((a, v) => (v[1] >= a[1] ? v : a), [null, 0])[0];",
"es5": "var mostFrequent = function mostFrequent(arr) {\n return Object.entries(arr.reduce(function (a, v) {\n a[v] = a[v] ? a[v] + 1 : 1;\n return a;\n }, {})).reduce(function (a, v) {\n return v[1] >= a[1] ? v : a;\n }, [null, 0])[0];\n};",
"example": "mostFrequent(['a', 'b', 'a', 'c', 'a', 'a', 'b']); // 'a'"
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"example": "const sum = pipeAsyncFunctions(\n x => x + 1,\n x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\n x => x + 3,\n async x => (await x) + 4\n);\n(async () => {\n console.log(await sum(5)); // 15 (after one second)\n})();"
"example": "const sum = pipeAsyncFunctions(\n x => x + 1,\n x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\n x => x + 3,\n async x => (await x) + 4\n);\n(async() => {\n console.log(await sum(5)); // 15 (after one second)\n})();"
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6
snippets/frequencies.md
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@ -9,12 +9,10 @@ Use `Array.prototype.reduce()` to map unique values to an object's keys, adding
```js
const frequencies = arr =>
arr.reduce(
(a, v) => {
arr.reduce((a, v) => {
a[v] = a[v] ? a[v] + 1 : 1;
return a;
}, {}
);
}, {});
```
```js

8
snippets/mostFrequent.md
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@ -10,12 +10,12 @@ Use `Object.entries()` on the result in combination with `Array.prototype.reduce
```js
const mostFrequent = arr =>
Object.entries(arr.reduce(
(a, v) => {
Object.entries(
arr.reduce((a, v) => {
a[v] = a[v] ? a[v] + 1 : 1;
return a;
}, {}
)).reduce((a, v) => v[1] >= a[1] ? v : a, [null, 0])[0];
}, {})
).reduce((a, v) => (v[1] >= a[1] ? v : a), [null, 0])[0];
```
```js

1
snippets/objectToQueryString.md
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@ -10,6 +10,7 @@ Determine the `symbol` to be either `?` or `&` based on the `length` of `querySt
Return the `queryString` or an empty string when the `queryParameters` are falsy.
```js
const objectToQueryString = queryParameters => {
return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {

3
snippets/pipeAsyncFunctions.md
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@ -14,13 +14,14 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
```
```js
const sum = pipeAsyncFunctions(
x => x + 1,
x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
x => x + 3,
async x => (await x) + 4
);
(async () => {
(async() => {
console.log(await sum(5)); // 15 (after one second)
})();
```

1
snippets/remove.md
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@ -9,7 +9,6 @@ Use `Array.prototype.filter()` to find array elements that return truthy values
The `func` is invoked with three arguments (`value, index, array`).
```js
const remove = (arr, func) =>
Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => {

1
snippets/size.md
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@ -12,6 +12,7 @@ Use `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API
Split strings into array of characters with `split('')` and return its length.
```js
const size = val =>
Array.isArray(val)
? val.length

14
test/_30s.js
View File

@ -381,6 +381,11 @@ const forOwnRight = (obj, fn) =>
Object.keys(obj)
.reverse()
.forEach(key => fn(obj[key], key, obj));
const frequencies = arr =>
arr.reduce((a, v) => {
a[v] = a[v] ? a[v] + 1 : 1;
return a;
}, {});
const fromCamelCase = (str, separator = '_') =>
str
.replace(/([a-z\d])([A-Z])/g, '$1' + separator + '$2')
@ -755,6 +760,13 @@ const midpoint = ([x1, y1], [x2, y2]) => [(x1 + x2) / 2, (y1 + y2) / 2];
const minBy = (arr, fn) => Math.min(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));
const minDate = dates => new Date(Math.min(...dates));
const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n);
const mostFrequent = arr =>
Object.entries(
arr.reduce((a, v) => {
a[v] = a[v] ? a[v] + 1 : 1;
return a;
}, {})
).reduce((a, v) => (v[1] >= a[1] ? v : a), [null, 0])[0];
const mostPerformant = (fns, iterations = 10000) => {
const times = fns.map(fn => {
const before = performance.now();
@ -1575,4 +1587,4 @@ const speechSynthesis = message => {
const squareSum = (...args) => args.reduce((squareSum, number) => squareSum + Math.pow(number, 2), 0);
module.exports = {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,checkProp,chunk,clampNumber,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compactWhitespace,compose,composeRight,converge,copyToClipboard,countBy,counter,countOccurrences,createDirIfNotExists,createElement,createEventHub,CSVToArray,CSVToJSON,currentURL,curry,dayOfYear,debounce,decapitalize,deepClone,deepFlatten,deepFreeze,deepGet,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,formatDuration,formToObject,forOwn,forOwnRight,fromCamelCase,functionName,functions,gcd,geometricProgression,get,getColonTimeFromDate,getDaysDiffBetweenDates,getImages,getMeridiemSuffixOfInteger,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,hashBrowser,hashNode,hasKey,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,hz,includesAll,includesAny,indentString,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithRangeRight,initializeArrayWithValues,initializeNDArray,inRange,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,isOdd,isPlainObject,isPowerOfTwo,isPrime,isPrimitive,isPromiseLike,isReadableStream,isSameDate,isSorted,isStream,isString,isSymbol,isTravisCI,isUndefined,isUpperCase,isValidJSON,isWeekday,isWeekend,isWritableStream,join,JSONtoCSV,JSONToFile,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapNumRange,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,objectToQueryString,observeMutations,off,offset,omit,omitBy,on,once,onUserInputChange,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,reducedFilter,reduceSuccessive,reduceWhich,reject,remove,removeNonASCII,renameKeys,reverseString,RGBToHex,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,serializeCookie,serializeForm,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,times,timeTaken,toCamelCase,toCurrency,toDecimalMark,toggleClass,toHash,toKebabCase,tomorrow,toOrdinalSuffix,toSafeInteger,toSnakeCase,toTitleCase,transform,triggerEvent,truncateString,truthCheckCollection,unary,uncurry,unescapeHTML,unflattenObject,unfold,union,unionBy,unionWith,uniqueElements,uniqueElementsBy,uniqueElementsByRight,uniqueSymmetricDifference,untildify,unzip,unzipWith,URLJoin,UUIDGeneratorBrowser,UUIDGeneratorNode,validateNumber,vectorDistance,weightedSample,when,without,words,xProd,yesNo,yesterday,zip,zipObject,zipWith,binarySearch,celsiusToFahrenheit,cleanObj,collatz,countVowels,factors,fahrenheitToCelsius,fibonacciCountUntilNum,fibonacciUntilNum,heronArea,howManyTimes,httpDelete,httpPut,isArmstrongNumber,isSimilar,JSONToDate,kmphToMph,levenshteinDistance,mphToKmph,pipeLog,quickSort,removeVowels,solveRPN,speechSynthesis,squareSum}
module.exports = {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,checkProp,chunk,clampNumber,cloneRegExp,coalesce,coalesceFactory,collectInto,colorize,compact,compactWhitespace,compose,composeRight,converge,copyToClipboard,countBy,counter,countOccurrences,createDirIfNotExists,createElement,createEventHub,CSVToArray,CSVToJSON,currentURL,curry,dayOfYear,debounce,decapitalize,deepClone,deepFlatten,deepFreeze,deepGet,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,formatDuration,formToObject,forOwn,forOwnRight,frequencies,fromCamelCase,functionName,functions,gcd,geometricProgression,get,getColonTimeFromDate,getDaysDiffBetweenDates,getImages,getMeridiemSuffixOfInteger,getScrollPosition,getStyle,getType,getURLParameters,groupBy,hammingDistance,hasClass,hasFlags,hashBrowser,hashNode,hasKey,head,hexToRGB,hide,httpGet,httpPost,httpsRedirect,hz,includesAll,includesAny,indentString,indexOfAll,initial,initialize2DArray,initializeArrayWithRange,initializeArrayWithRangeRight,initializeArrayWithValues,initializeNDArray,inRange,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,isOdd,isPlainObject,isPowerOfTwo,isPrime,isPrimitive,isPromiseLike,isReadableStream,isSameDate,isSorted,isStream,isString,isSymbol,isTravisCI,isUndefined,isUpperCase,isValidJSON,isWeekday,isWeekend,isWritableStream,join,JSONtoCSV,JSONToFile,last,lcm,longestItem,lowercaseKeys,luhnCheck,mapKeys,mapNumRange,mapObject,mapString,mapValues,mask,matches,matchesWith,maxBy,maxDate,maxN,median,memoize,merge,midpoint,minBy,minDate,minN,mostFrequent,mostPerformant,negate,nest,nodeListToArray,none,nthArg,nthElement,objectFromPairs,objectToPairs,objectToQueryString,observeMutations,off,offset,omit,omitBy,on,once,onUserInputChange,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,reducedFilter,reduceSuccessive,reduceWhich,reject,remove,removeNonASCII,renameKeys,reverseString,RGBToHex,round,runAsync,runPromisesInSeries,sample,sampleSize,scrollToTop,sdbm,serializeCookie,serializeForm,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,times,timeTaken,toCamelCase,toCurrency,toDecimalMark,toggleClass,toHash,toKebabCase,tomorrow,toOrdinalSuffix,toSafeInteger,toSnakeCase,toTitleCase,transform,triggerEvent,truncateString,truthCheckCollection,unary,uncurry,unescapeHTML,unflattenObject,unfold,union,unionBy,unionWith,uniqueElements,uniqueElementsBy,uniqueElementsByRight,uniqueSymmetricDifference,untildify,unzip,unzipWith,URLJoin,UUIDGeneratorBrowser,UUIDGeneratorNode,validateNumber,vectorDistance,weightedSample,when,without,words,xProd,yesNo,yesterday,zip,zipObject,zipWith,binarySearch,celsiusToFahrenheit,cleanObj,collatz,countVowels,factors,fahrenheitToCelsius,fibonacciCountUntilNum,fibonacciUntilNum,heronArea,howManyTimes,httpDelete,httpPut,isArmstrongNumber,isSimilar,JSONToDate,kmphToMph,levenshteinDistance,mphToKmph,pipeLog,quickSort,removeVowels,solveRPN,speechSynthesis,squareSum}

24
vscode_snippets/snippets.json
View File

@ -961,6 +961,17 @@
],
"description": "Iterates over all own properties of an object in reverse, running a callback for each one.\n\nUse `Object.keys(obj)` to get all the properties of the object, `Array.prototype.reverse()` to reverse their order and `Array.prototype.forEach()` to run the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.\n"
},
"frequencies": {
"prefix": "30s_frequencies",
"body": [
"const frequencies = arr =>",
" arr.reduce((a, v) => {",
" a[v] = a[v] ? a[v] + 1 : 1;",
" return a;",
" }, {});"
],
"description": "Returns an object with the unique values of an array as keys and their frequencies as the values.\n\nUse `Array.prototype.reduce()` to map unique values to an object's keys, adding to existing keys every time the same value is encountered.\n"
},
"fromCamelCase": {
"prefix": "30s_fromCamelCase",
"body": [
@ -2001,6 +2012,19 @@
],
"description": "Returns the `n` minimum elements from the provided array.\nIf `n` is greater than or equal to the provided array's length, then return the original array (sorted in ascending order).\n\nUse `Array.prototype.sort()` combined with the spread operator (`...`) to create a shallow clone of the array and sort it in ascending order.\nUse `Array.prototype.slice()` to get the specified number of elements.\nOmit the second argument, `n`, to get a one-element array.\n"
},
"mostFrequent": {
"prefix": "30s_mostFrequent",
"body": [
"const mostFrequent = arr =>",
" Object.entries(",
" arr.reduce((a, v) => {",
" a[v] = a[v] ? a[v] + 1 : 1;",
" return a;",
" }, {})",
" ).reduce((a, v) => (v[1] >= a[1] ? v : a), [null, 0])[0];"
],
"description": "Returns the most frequent element in an array.\n\nUse `Array.prototype.reduce()` to map unique values to an object's keys, adding to existing keys every time the same value is encountered.\nUse `Object.entries()` on the result in combination with `Array.prototype.reduce()` to get the most frequent value in the array.\n"
},
"mostPerformant": {
"prefix": "30s_mostPerformant",
"body": [