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Add weightedSample snippet

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This commit is contained in:
Angelos Chalaris
2019-12-31 11:34:26 +02:00
parent 6ea98b02ad
commit 21b0ab5c65
10 changed files with 164 additions and 95 deletions
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9
dist/_30s.es5.js vendored
View File

@ -2615,6 +2615,14 @@
}, 0);
return Math.sqrt(sum);
};
var weightedSample = function weightedSample(arr, weights) {
var roll = Math.random();
return arr[weights.reduce(function (acc, w, i) {
return i === 0 ? [w] : [].concat(_toConsumableArray(acc), [acc[acc.length - 1] + w]);
}, []).findIndex(function (v, i, s) {
return roll >= (i === 0 ? 0 : s[i - 1]) && roll < v;
})];
};
var when = function when(pred, whenTrue) {
return function (x) {
return pred(x) ? whenTrue(x) : x;
@ -3270,6 +3278,7 @@
exports.UUIDGeneratorNode = UUIDGeneratorNode;
exports.validateNumber = validateNumber;
exports.vectorDistance = vectorDistance;
exports.weightedSample = weightedSample;
exports.when = when;
exports.without = without;
exports.words = words;

2
dist/_30s.es5.min.js vendored
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File diff suppressed because one or more lines are too long

15
dist/_30s.esm.js vendored
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@ -1370,6 +1370,19 @@ const vectorDistance = (...coords) => {
.reduce((acc, val, i) => acc + Math.pow(val - coords[pointLength + i], 2), 0);
return Math.sqrt(sum);
};
const weightedSample = (arr, weights) => {
let roll = Math.random();
return arr[
weights
.reduce((acc, w, i) =>
i === 0 ? [w] : [...acc, acc[acc.length - 1] + w],
[]
)
.findIndex((v, i, s) =>
roll >= (i === 0 ? 0 : s[i - 1]) && roll < v
)
];
};
const when = (pred, whenTrue) => x => (pred(x) ? whenTrue(x) : x);
const without = (arr, ...args) => arr.filter(v => !args.includes(v));
const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);
@ -1560,4 +1573,4 @@ const speechSynthesis = message => {
};
const squareSum = (...args) => args.reduce((squareSum, number) => squareSum + Math.pow(number, 2), 0);
export { 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, 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, 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 };
export { 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, 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 };

14
dist/_30s.js vendored
View File

@ -1376,6 +1376,19 @@
.reduce((acc, val, i) => acc + Math.pow(val - coords[pointLength + i], 2), 0);
return Math.sqrt(sum);
};
const weightedSample = (arr, weights) => {
let roll = Math.random();
return arr[
weights
.reduce((acc, w, i) =>
i === 0 ? [w] : [...acc, acc[acc.length - 1] + w],
[]
)
.findIndex((v, i, s) =>
roll >= (i === 0 ? 0 : s[i - 1]) && roll < v
)
];
};
const when = (pred, whenTrue) => x => (pred(x) ? whenTrue(x) : x);
const without = (arr, ...args) => arr.filter(v => !args.includes(v));
const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);
@ -1912,6 +1925,7 @@
exports.UUIDGeneratorNode = UUIDGeneratorNode;
exports.validateNumber = validateNumber;
exports.vectorDistance = vectorDistance;
exports.weightedSample = weightedSample;
exports.when = when;
exports.without = without;
exports.words = words;

75
package-lock.json generated
View File

@ -1047,8 +1047,7 @@
"commander": {
"version": "2.20.3",
"resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
"integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
"optional": true
"integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ=="
},
"component-emitter": {
"version": "1.3.0",
@ -2639,6 +2638,7 @@
"@jest/types": "^24.9.0",
"anymatch": "^2.0.0",
"fb-watchman": "^2.0.0",
"fsevents": "^1.2.7",
"graceful-fs": "^4.1.15",
"invariant": "^2.2.4",
"jest-serializer": "^24.9.0",
@ -5086,8 +5086,7 @@
"source-map": {
"version": "0.6.1",
"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
"integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
"optional": true
"integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
}
}
},
@ -8623,7 +8622,6 @@
"version": "1.2.9",
"resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.9.tgz",
"integrity": "sha512-oeyj2H3EjjonWcFjD5NvZNE9Rqe4UW+nQBU2HNeKw0koVLEFIhtyETyAakeAM3de7Z/SW5kcA+fZUait9EApnw==",
"dev": true,
"optional": true,
"requires": {
"nan": "^2.12.1",
@ -8633,25 +8631,21 @@
"abbrev": {
"version": "1.1.1",
"bundled": true,
"dev": true,
"optional": true
},
"ansi-regex": {
"version": "2.1.1",
"bundled": true,
"dev": true,
"optional": true
},
"aproba": {
"version": "1.2.0",
"bundled": true,
"dev": true,
"optional": true
},
"are-we-there-yet": {
"version": "1.1.5",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"delegates": "^1.0.0",
@ -8661,13 +8655,11 @@
"balanced-match": {
"version": "1.0.0",
"bundled": true,
"dev": true,
"optional": true
},
"brace-expansion": {
"version": "1.1.11",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"balanced-match": "^1.0.0",
@ -8677,37 +8669,31 @@
"chownr": {
"version": "1.1.1",
"bundled": true,
"dev": true,
"optional": true
},
"code-point-at": {
"version": "1.1.0",
"bundled": true,
"dev": true,
"optional": true
},
"concat-map": {
"version": "0.0.1",
"bundled": true,
"dev": true,
"optional": true
},
"console-control-strings": {
"version": "1.1.0",
"bundled": true,
"dev": true,
"optional": true
},
"core-util-is": {
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true
},
"debug": {
"version": "4.1.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"ms": "^2.1.1"
@ -8716,25 +8702,21 @@
"deep-extend": {
"version": "0.6.0",
"bundled": true,
"dev": true,
"optional": true
},
"delegates": {
"version": "1.0.0",
"bundled": true,
"dev": true,
"optional": true
},
"detect-libc": {
"version": "1.0.3",
"bundled": true,
"dev": true,
"optional": true
},
"fs-minipass": {
"version": "1.2.5",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"minipass": "^2.2.1"
@ -8743,13 +8725,11 @@
"fs.realpath": {
"version": "1.0.0",
"bundled": true,
"dev": true,
"optional": true
},
"gauge": {
"version": "2.7.4",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"aproba": "^1.0.3",
@ -8765,7 +8745,6 @@
"glob": {
"version": "7.1.3",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"fs.realpath": "^1.0.0",
@ -8779,13 +8758,11 @@
"has-unicode": {
"version": "2.0.1",
"bundled": true,
"dev": true,
"optional": true
},
"iconv-lite": {
"version": "0.4.24",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"safer-buffer": ">= 2.1.2 < 3"
@ -8794,7 +8771,6 @@
"ignore-walk": {
"version": "3.0.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"minimatch": "^3.0.4"
@ -8803,7 +8779,6 @@
"inflight": {
"version": "1.0.6",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"once": "^1.3.0",
@ -8813,19 +8788,16 @@
"inherits": {
"version": "2.0.3",
"bundled": true,
"dev": true,
"optional": true
},
"ini": {
"version": "1.3.5",
"bundled": true,
"dev": true,
"optional": true
},
"is-fullwidth-code-point": {
"version": "1.0.0",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"number-is-nan": "^1.0.0"
@ -8834,13 +8806,11 @@
"isarray": {
"version": "1.0.0",
"bundled": true,
"dev": true,
"optional": true
},
"minimatch": {
"version": "3.0.4",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"brace-expansion": "^1.1.7"
@ -8849,13 +8819,11 @@
"minimist": {
"version": "0.0.8",
"bundled": true,
"dev": true,
"optional": true
},
"minipass": {
"version": "2.3.5",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"safe-buffer": "^5.1.2",
@ -8865,7 +8833,6 @@
"minizlib": {
"version": "1.2.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"minipass": "^2.2.1"
@ -8874,7 +8841,6 @@
"mkdirp": {
"version": "0.5.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"minimist": "0.0.8"
@ -8883,13 +8849,11 @@
"ms": {
"version": "2.1.1",
"bundled": true,
"dev": true,
"optional": true
},
"needle": {
"version": "2.3.0",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"debug": "^4.1.0",
@ -8900,7 +8864,6 @@
"node-pre-gyp": {
"version": "0.12.0",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"detect-libc": "^1.0.2",
@ -8918,7 +8881,6 @@
"nopt": {
"version": "4.0.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"abbrev": "1",
@ -8928,13 +8890,11 @@
"npm-bundled": {
"version": "1.0.6",
"bundled": true,
"dev": true,
"optional": true
},
"npm-packlist": {
"version": "1.4.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"ignore-walk": "^3.0.1",
@ -8944,7 +8904,6 @@
"npmlog": {
"version": "4.1.2",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"are-we-there-yet": "~1.1.2",
@ -8956,19 +8915,16 @@
"number-is-nan": {
"version": "1.0.1",
"bundled": true,
"dev": true,
"optional": true
},
"object-assign": {
"version": "4.1.1",
"bundled": true,
"dev": true,
"optional": true
},
"once": {
"version": "1.4.0",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"wrappy": "1"
@ -8977,19 +8933,16 @@
"os-homedir": {
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true
},
"os-tmpdir": {
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true
},
"osenv": {
"version": "0.1.5",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"os-homedir": "^1.0.0",
@ -8999,19 +8952,16 @@
"path-is-absolute": {
"version": "1.0.1",
"bundled": true,
"dev": true,
"optional": true
},
"process-nextick-args": {
"version": "2.0.0",
"bundled": true,
"dev": true,
"optional": true
},
"rc": {
"version": "1.2.8",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"deep-extend": "^0.6.0",
@ -9023,7 +8973,6 @@
"minimist": {
"version": "1.2.0",
"bundled": true,
"dev": true,
"optional": true
}
}
@ -9031,7 +8980,6 @@
"readable-stream": {
"version": "2.3.6",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"core-util-is": "~1.0.0",
@ -9046,7 +8994,6 @@
"rimraf": {
"version": "2.6.3",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"glob": "^7.1.3"
@ -9055,43 +9002,36 @@
"safe-buffer": {
"version": "5.1.2",
"bundled": true,
"dev": true,
"optional": true
},
"safer-buffer": {
"version": "2.1.2",
"bundled": true,
"dev": true,
"optional": true
},
"sax": {
"version": "1.2.4",
"bundled": true,
"dev": true,
"optional": true
},
"semver": {
"version": "5.7.0",
"bundled": true,
"dev": true,
"optional": true
},
"set-blocking": {
"version": "2.0.0",
"bundled": true,
"dev": true,
"optional": true
},
"signal-exit": {
"version": "3.0.2",
"bundled": true,
"dev": true,
"optional": true
},
"string-width": {
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"code-point-at": "^1.0.0",
@ -9102,7 +9042,6 @@
"string_decoder": {
"version": "1.1.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"safe-buffer": "~5.1.0"
@ -9111,7 +9050,6 @@
"strip-ansi": {
"version": "3.0.1",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"ansi-regex": "^2.0.0"
@ -9120,13 +9058,11 @@
"strip-json-comments": {
"version": "2.0.1",
"bundled": true,
"dev": true,
"optional": true
},
"tar": {
"version": "4.4.8",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"chownr": "^1.1.1",
@ -9141,13 +9077,11 @@
"util-deprecate": {
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true
},
"wide-align": {
"version": "1.1.3",
"bundled": true,
"dev": true,
"optional": true,
"requires": {
"string-width": "^1.0.2 || 2"
@ -9156,13 +9090,11 @@
"wrappy": {
"version": "1.0.2",
"bundled": true,
"dev": true,
"optional": true
},
"yallist": {
"version": "3.0.3",
"bundled": true,
"dev": true,
"optional": true
}
}
@ -10978,7 +10910,6 @@
"version": "2.14.0",
"resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
"integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==",
"dev": true,
"optional": true
},
"nanomatch": {

16
snippet_data/snippetList.json
View File

@ -5470,6 +5470,22 @@
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"tags": [
"array",
"random",
"advanced"
]
},
"meta": {
"hash": "6bba5ca7427489cdf18476542772743ae2d5f4eccb42ff93ee61b9f8ba1f55d6"
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"type": "snippetListing",

66
snippet_data/snippets.json
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@ -1363,8 +1363,8 @@
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@ -8930,6 +8930,32 @@
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},
{
"id": "weightedSample",
"title": "weightedSample",
"type": "snippet",
"attributes": {
"fileName": "weightedSample.md",
"text": "Returns a random element from an array, using the provided `weights` as the probabilities for each element.\n\nUse `Array.prototype.reduce()` to create an array of partial sums for each value in `weights`.\nUse `Math.random()` to generate a random number and `Array.prototype.findIndex()` to find the correct index based on the array previously produced.\nFinally, return the element of `arr` with the produced index.\n\n\n",
"codeBlocks": {
"es6": "const weightedSample = (arr, weights) => {\n let roll = Math.random();\n return arr[\n weights\n .reduce((acc, w, i) =>\n i === 0 ? [w] : [...acc, acc[acc.length - 1] + w],\n []\n )\n .findIndex((v, i, s) =>\n roll >= (i === 0 ? 0 : s[i - 1]) && roll < v\n )\n ];\n}",
"es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar weightedSample = function weightedSample(arr, weights) {\n var roll = Math.random();\n return arr[weights.reduce(function (acc, w, i) {\n return i === 0 ? [w] : [].concat(_toConsumableArray(acc), [acc[acc.length - 1] + w]);\n }, []).findIndex(function (v, i, s) {\n return roll >= (i === 0 ? 0 : s[i - 1]) && roll < v;\n })];\n};",
"example": "weightedSample([3, 7, 9, 11], [0.1, 0.2, 0.6, 0.1]); // 9"
},
"tags": [
"array",
"random",
"advanced"
]
},
"meta": {
"hash": "6bba5ca7427489cdf18476542772743ae2d5f4eccb42ff93ee61b9f8ba1f55d6",
"firstSeen": "",
"lastUpdated": "",
"updateCount": 1,
"authorCount": 1
}
},
{
"id": "when",
"title": "when",

31
snippets/weightedSample.md Normal file
View File

@ -0,0 +1,31 @@
---
title: weightedSample
tags: array,random,advanced
---
Returns a random element from an array, using the provided `weights` as the probabilities for each element.
Use `Array.prototype.reduce()` to create an array of partial sums for each value in `weights`.
Use `Math.random()` to generate a random number and `Array.prototype.findIndex()` to find the correct index based on the array previously produced.
Finally, return the element of `arr` with the produced index.
```js
const weightedSample = (arr, weights) => {
let roll = Math.random();
return arr[
weights
.reduce((acc, w, i) =>
i === 0 ? [w] : [...acc, acc[acc.length - 1] + w],
[]
)
.findIndex((v, i, s) =>
roll >= (i === 0 ? 0 : s[i - 1]) && roll < v
)
];
}
```
```js
weightedSample([3, 7, 9, 11], [0.1, 0.2, 0.6, 0.1]); // 9
```

15
test/_30s.js
View File

@ -1375,6 +1375,19 @@ const vectorDistance = (...coords) => {
.reduce((acc, val, i) => acc + Math.pow(val - coords[pointLength + i], 2), 0);
return Math.sqrt(sum);
};
const weightedSample = (arr, weights) => {
let roll = Math.random();
return arr[
weights
.reduce((acc, w, i) =>
i === 0 ? [w] : [...acc, acc[acc.length - 1] + w],
[]
)
.findIndex((v, i, s) =>
roll >= (i === 0 ? 0 : s[i - 1]) && roll < v
)
];
}
const when = (pred, whenTrue) => x => (pred(x) ? whenTrue(x) : x);
const without = (arr, ...args) => arr.filter(v => !args.includes(v));
const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);
@ -1566,4 +1579,4 @@ 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,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,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,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,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}

16
test/weightedSample.test.js Normal file
View File

@ -0,0 +1,16 @@
const {weightedSample} = require('./_30s.js');
test('sample is a Function', () => {
expect(weightedSample).toBeInstanceOf(Function);
});
const arr = [3, 7, 9, 11];
const weights = [0.1, 0.2, 0.6, 0.1];
test('Returns a random element from the array', () => {
expect(arr.includes(weightedSample(arr, weights))).toBeTruthy();
});
test('Works for single-element arrays', () => {
expect(weightedSample([1], [1])).toBe(1);
});
test('Returns undefined for empty array', () => {
expect(weightedSample([], [])).toBe(undefined);
});