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md-variables.json
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md-variables.json
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{
"just-cartesian-product": {
"packageName": "just-cartesian-product",
"dir": "array-cartesian-product",
"description": "Takes an input of an array of arrays and returns their Cartesian product.",
"examples": [
"import cartesianProduct from 'just-cartesian-product';",
"",
"cartesianProduct([[1, 2], ['a', 'b']]); // [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]",
"cartesianProduct([[1, 2], ['a', 'b', 'c']]); // [[1, 'a'], [1, 'b'], [1, 'c'], [2, 'a'], [2, 'b'], [2, 'c']]",
"cartesianProduct([]); // []",
"cartesianProduct(); // throws"
]
},
"just-compact": {
"packageName": "just-compact",
"dir": "array-compact",
"description": "Returns a copy of an array with falsey values removed",
"examples": [
"import compact from 'just-compact';",
"",
"compact([1, null, 2, undefined, null, NaN, 3, 4, false, 5]); // [1, 2, 3, 4, 5]",
"compact([1, 2, [], 4, {}]); // [1, 2, [], 4, {}]",
"compact([]); // []",
"compact({}); // throws"
]
},
"just-flatten-it": {
"packageName": "just-flatten-it",
"dir": "array-flatten",
"description": "Return a flattened array",
"examples": [
"import flatten from 'just-flatten-it';",
"",
"flatten([[1, [2, 3]], [[4, 5], 6, 7, [8, 9]]]);",
"// [1, 2, 3, 4, 5, 6, 7, 8, 9]",
"",
"flatten([[1, [2, 3]], [[4, 5], 6, 7, [8, 9]]], 1);",
"// [1, [2, 3], [[4, 5], 6, 7, [8, 9]]]"
]
},
"just-group-by": {
"packageName": "just-group-by",
"dir": "array-group-by",
"description": "Return a grouped object from array",
"examples": [
"import groupBy from 'just-group-by';",
"",
"groupBy([6.1, 4.2, 6.3], Math.floor); // { '4': [4.2], '6': [6.1, 6.3] }",
"groupBy([1,2,3,4,5,6,7,8], function(i) { return i % 2}); // { '0': [2, 4, 6, 8], '1': [1, 3, 5, 7] }"
]
},
"just-index": {
"packageName": "just-index",
"dir": "array-index",
"description": "Return an object from an array, keyed by the value at the given id",
"examples": [
"import index from 'just-index';",
"",
"index([{id: 'first', val: 1}, {id: 'second', val: 2}], 'id');",
"// {first: {id: 'first', val: 1}, second: {id: 'second', val: 2}}",
"index([{id: 'first', val: 1}, null], 'id'); // {first: {id: 'first', val: 1}}",
"index([], 'id'); // {}",
"index([], null); // undefined",
"index({}, 'id'); // undefined"
]
},
"just-insert": {
"packageName": "just-insert",
"dir": "array-insert",
"description": "Inserts a sub-array into an array starting at the given index. Returns a copy",
"examples": [
"import insert from 'just-insert';",
"",
"insert([1, 2, 5, 6], ['a', 'c', 'e'], 2); // [1, 2, 'a', 'c', 'e', 5, 6]",
"insert([1, 2, 5, 6], 'a', 2); // [1, 2, 'a', 5, 6]",
"insert([1, 2, 5, 6], ['a', 'c', 'e'], 0); // ['a', 'c', 'e', 1, 2, 5, 6]",
"insert([1, 2, 5, 6], ['a', 'c', 'e']); // ['a', 'c', 'e', 1, 2, 5, 6]"
]
},
"just-intersect": {
"packageName": "just-intersect",
"dir": "array-intersect",
"description": "Return the intersect of two arrays",
"examples": [
"import intersect from 'just-intersect';",
"",
"intersect([1, 2, 5, 6], [2, 3, 5, 6]); // [2, 5, 6]",
"intersect([1, 2, 2, 4, 5], [3, 2, 2, 5, 7]); // [2, 5] "
]
},
"just-last": {
"packageName": "just-last",
"dir": "array-last",
"description": "Return the last member of an array",
"examples": [
"import last from 'just-last';",
"",
"last([1, 2, 3, 4, 5]); // 5",
"last([{a: 1}, {b: 1}, {c: 1}]); // {c: 1}",
"last([true, false, [true, false]]); // [true, false]",
"last(); // undefined",
"last([]); // undefined",
"last(null); // undefined",
"last(undefined); // undefined"
]
},
"just-mean": {
"packageName": "just-mean",
"dir": "array-mean",
"description": "The mean (average) value in an array",
"examples": [
"import mean from 'just-mean';",
"",
"mean([1, 2, 3, 2, 4, 1]); // 2.1666666667",
"mean(3, 2, 1); // 2",
"mean([4]); // 4",
"mean(['3', 2]); // throws",
"mean(); // throws"
]
},
"just-median": {
"packageName": "just-median",
"dir": "array-median",
"description": "Return the median value of an array of numbers",
"examples": [
"import median from 'just-median';",
"",
"median([1, 2, 3, 4, 5]); // 3",
"median([3, -1, 2]); // 2",
"median([9, 14, 14, 200, 15]); // 14",
"median(1, 2, 4, 3); // 2.5",
"median(['3', 2, 1]); // throws",
"median(); // throws"
]
},
"just-mode": {
"packageName": "just-mode",
"dir": "array-mode",
"description": "Return the most frequently occuring number(s)",
"examples": [
"import mode from 'just-mode';",
"",
"mode([1, 2, 3, 2]); // 2",
"mode(4, 4, 1, 4); // 4",
"mode(100, 100, 101, 101); // [100, 101]",
"mode(4, 3, 2, 1); // [1, 2, 3, 4]",
"mode(['1', 2, 2, 1, 2]); // throws",
"mode(null); // throws"
]
},
"just-partition": {
"packageName": "just-partition",
"dir": "array-partition",
"description": "Elements satisfying predicate added to first array, remainder added to second",
"examples": [
"import partition from 'just-partition';",
"",
"partition([1, 5, 2, 4, 3], n => n > 3); // [[5, 4],[1, 2, 3]]",
"partition(['a', 2, 3, '3'], x => typeof x == 'string'); // [['a', '3'],[2, 3]]",
"partition([1, 2, 3, 4], x => typeof x == 'number'); // [[1, 2, 3, 4],[]]",
"partition([1, 2, 3, 4], x => typeof x == 'string'); // [[], [1, 2, 3, 4]]",
"partition([], n => n > 3); // [[], []]",
"partition({a: 1, b: 2}, n => n > 1); // throws",
"partition(null, n => n > 1); // throws",
"partition(undefined, n => n > 1); // throws"
]
},
"just-percentile": {
"packageName": "just-percentile",
"dir": "array-percentile",
"description": "Return the value at the given percentile (using linear interpolation)",
"examples": [
"import percentile from 'just-percentile';",
"",
"percentile([1, 2, 3], 0); // 1",
"percentile([1, 2, 3], 50); // 2",
"percentile([1, 2, 3], 100); // 3",
"",
"// See https://en.wikipedia.org/wiki/Percentile (linear interpolation method)",
"percentile([15, 20, 35, 40, 50], 5); // 15",
"percentile([15, 20, 35, 40, 50], 30); // 20",
"percentile([15, 20, 35, 40, 50], 40); // 27.5",
"percentile([15, 20, 35, 40, 50], 95); // 50",
"",
"percentile(1, 2, 3, 50); // throws",
"percentile(['1', 2, 3], 50); // throws",
"percentile([], 50); // throws"
]
},
"just-permutations": {
"packageName": "just-permutations",
"dir": "array-permutations",
"description": "Returns all permutations of the length N of the elements of the given Array",
"examples": [
"import permutations from 'just-array-permutations;",
"",
"permutations([1, 2, 3]); // [[1, 2, 3], [2, 1, 3], [2, 3, 1], [1, 3, 2], [3, 1, 2], [3, 2, 1]]",
"permutations([]); // []",
"permutations(); // throws"
]
},
"just-random": {
"packageName": "just-random",
"dir": "array-random",
"description": "Return a randomly selected element in an array",
"examples": [
"import random from 'just-random';",
"",
"random([1, 2, 3]);",
"// one of [1, 2, 3], at random"
]
},
"just-range": {
"packageName": "just-range",
"dir": "array-range",
"description": "Generate a range array for numbers",
"examples": [
"import range from 'just-range';",
"",
"range(1, 5); // [1, 2, 3, 4]",
"range(5); // [0, 1, 2, 3, 4]",
"range(-5); // [0, -1, -2, -3, -4]",
"range(0, 20, 5) // [0, 5, 10, 15]"
]
},
"just-remove": {
"packageName": "just-remove",
"dir": "array-remove",
"description": "Removes one array from another",
"examples": [
"import remove from 'just-remove';",
"",
"remove([1, 2, 3, 4, 5, 6], [1, 3, 6]); // [2, 4, 5]"
]
},
"just-shuffle": {
"packageName": "just-shuffle",
"dir": "array-shuffle",
"description": "Return the elements of an array in random order",
"examples": [
"import shuffle from 'just-shuffle';",
"",
"shuffle([1, 2, 3]); ",
"// array with original elements randomly sorted",
"shuffle([1, 2, 3], {shuffleAll: true}); ",
"// array with original elements randomly sorted and all in new postions",
"shuffle([]); // []",
"shuffle([1]); // [1]",
"shuffle(); // throws",
"shuffle(undefined); // throws",
"shuffle(null); // throws",
"shuffle({}); // throws"
]
},
"just-skewness": {
"packageName": "just-skewness",
"dir": "array-skewness",
"description": "Return the skewness of an array or numeric argument list using Pearson's second skewness coefficient",
"examples": [
"import skewness from \"just-skewness\";",
"",
"// Using Pearson's second skewness coefficient",
"skewness(3, 2, 1); // 0",
"skewness([1, 2, 3, 2, 4, 1]); // 0.4276994613841504",
"skewness(1, 2, 3, 4, 5, -6); // -0.762000762001143",
"skewness([1, 2, 3, 4, 9]); // 0.7705935588815224",
"skewness([4]); // throws",
"skewness([\"3\", 2]); // throws",
"skewness(NaN, NaN); // throws",
"skewness(); // throws"
]
},
"just-sort-by": {
"packageName": "just-sort-by",
"dir": "array-sort-by",
"description": "Produces a new array, sorted in ascending order",
"examples": [
"import sortBy from 'just-sort-by';",
"",
"sortBy([10, 1, 5, 20, 15, 35, 30, 6, 8]); // [1, 5, 6, 8, 10, 15, 20, 30, 35]",
"",
"sortBy([",
" {user: 'fabio', details: {city: \"Milan\", age: 34}},",
" {user: 'max', details: {city: \"Munich\", age: 29}},",
" {user: 'zacarias', details: {city: \"Sao Paulo\", age: 44}},",
" {user: 'robert', details: {city: \"Manchester\", age: 28}},",
" {user: 'klaus', details: {city: \"Zurich\", age: 38}},",
"], function(o) {",
" return o.details.age;",
"});",
"",
"/*",
"[",
" {user: 'robert', age: 28},",
" {user: 'max', age: 29},",
" {user: 'fabio', age: 34},",
" {user: 'klaus', age: 38},",
" {user: 'zacarias', age: 44},",
"]",
"*/",
"",
"sortBy([",
" {user: 'fabio', age: 34},",
" {user: 'max', age: 29},",
" {user: 'zacarias', age: 44},",
" {user: 'robert', age: 28},",
" {user: 'klaus', age: 38},",
"], 'user');",
"/*",
"[",
" {user: 'fabio', age: 34},",
" {user: 'klaus', age: 38},",
" {user: 'max', age: 29},",
" {user: 'robert', age: 28},",
" {user: 'zacarias', age: 44},",
"]",
"*/"
]
},
"just-split": {
"packageName": "just-split",
"dir": "array-split",
"description": "Splits array into groups of n items each",
"examples": [
"import split from 'just-split';",
"",
"split([]); // []",
"split([1, 2, 3, 4, 5]); // [[1, 2, 3, 4, 5]]",
"split([1, 2, 3, 4, 5, 6, 7, 8, 9], 3); // [[1, 2, 3], [4, 5, 6], [7, 8, 9]]",
"split([1, 2, 3, 4, 5, 6, 7, 8, 9], '3'); // [[1, 2, 3], [4, 5, 6], [7, 8, 9]]",
"split(['a', 'b', 'c', 'd', 'e'], 2); // [['a', 'b'], ['c', 'd'], ['e']]",
"split([1, 2, 3, 4, 5, 6, 7, 8], 3); // [[1, 2, 3], [4, 5, 6], [7, 8]]"
]
},
"just-split-at": {
"packageName": "just-split-at",
"dir": "array-split-at",
"description": "Splits an array into two at a given position",
"examples": [
"import splitAt from 'just-split-at';",
"",
"splitAt([1, 2, 3, 4, 5], 2); // [[1, 2], [3, 4, 5]]",
"splitAt([{a: 1}, {b: 1}, {c: 1}], -1); // [[{a: 1}, {b: 1}], [{c: 1}]]",
"splitAt([], 2); // [[], []]",
"splitAt(null, 1); // throws",
"splitAt(undefined, 1); // throws"
]
},
"just-standard-deviation": {
"packageName": "just-standard-deviation",
"dir": "array-standard-deviation",
"description": "Return the standard deviation of an array or numeric argument list",
"examples": [
"import standardDeviation from \"just-standard-deviation\";",
"",
"standardDeviation([1, 2, 3, 2, 4, 1]); // 1.16904519",
"standardDeviation(3, 2, 1); // 1",
"standardDeviation([100, 100, 100.1, 100]); // 0.05",
"standardDeviation(1, 2, 3, 4, 5, -6); // 3.9370039",
"standardDeviation([4]); // throws",
"standardDeviation([\"3\", 2]); // throws",
"standardDeviation(NaN, NaN); // throws",
"standardDeviation(); // throws"
]
},
"just-tail": {
"packageName": "just-tail",
"dir": "array-tail",
"description": "Return all but the first element of an array",
"examples": [
"import tail from 'just-tail';",
"",
"tail([1, 2, 3, 4, 5]); // [2, 3, 4, 5]",
"tail([{a: 1}, {b: 1}, {c: 1}]); // [{b: 1}, {c: 1}]",
"tail([true, false, [true, false]]); // [false, [true, false]]",
"tail([]); // []",
"tail(); // undefined",
"tail(null); // undefined",
"tail(undefined); // undefined"
]
},
"just-union": {
"packageName": "just-union",
"dir": "array-union",
"description": "Returns the union of two arrays",
"examples": [
"import union from 'just-union';",
"",
"union([1, 2, 5, 6], [2, 3, 4, 6]); // [1, 2, 3, 4, 5, 6]"
]
},
"just-unique": {
"packageName": "just-unique",
"dir": "array-unique",
"description": "Dedupes an array",
"examples": [
"import unique from 'just-unique';",
"",
"unique([1, 2, 3, 2, 3, 4, 3, 2, 1, 3]); // [1, 2, 3, 4]",
"",
"var a = {a: 3};",
"var b = {b: 4};",
"var c = {c: 5};",
"unique([a, a, b, c, b]); // [a, b, c]",
"",
"unique([1, '1', 2, '2', 3, 2]); // [1, '1', 2, '2', 3]",
"",
"// declaring sorted array for performance",
"unique([1, 1, '1', 2, 2, 5, '5', '5'], true); // [1, '1', 2, 5, '6']",
"",
"// declaring strings array for performance",
"unique(['a', 'c', 'b', 'c', 'a'], false, true); // ['a', 'b', 'c']"
]
},
"just-variance": {
"packageName": "just-variance",
"dir": "array-variance",
"description": "Return the standard deviation of an array or numeric argument list",
"examples": [
"import variance from 'just-variance';",
"",
"variance([1, 2, 3, 2, 4, 1]); // 1.3666666667",
"variance(3, 2, 1); // 1",
"variance([100, 100, 100.1, 100]); // 0.0025",
"variance(1, 2, 3, 4, 5, -6); // 15.5",
"variance([4]); // throws",
"variance(['3', 2]); // throws",
"variance(NaN, NaN); // throws",
"variance(); // throws"
]
},
"just-zip-it": {
"packageName": "just-zip-it",
"dir": "array-zip",
"description": "Returns an array of grouped elements, taking n-th element from every given array",
"examples": [
"import zip from 'just-zip-it';",
"",
"zip([1, 2, 3]); // [[1], [2], [3]]",
"zip([1, 2, 3], ['a', 'b', 'c']); // [[1, 'a'], [2, 'b'], [3, 'c']]",
"zip([1, 2], ['a', 'b'], [true, false]); //[[1, 'a', true], [2, 'b', false]]",
"",
"zip(undefined, {}, false, 1, 'foo'); // []",
"zip([1, 2], ['a', 'b'], undefined, {}, false, 1, 'foo'); // [[1, 'a'], [2, 'b']]",
"",
"zip([1, 2, 3], ['a', 'b'], [true]); // [[1, 'a', true], [2, 'b', undefined], [3, undefined, undefined]]"
]
},
"just-clone": {
"packageName": "just-clone",
"dir": "collection-clone",
"description": "Deep copies objects, arrays, maps and sets",
"examples": [
"// Deep copies objects and arrays, doesn't clone functions",
"",
"import clone from 'just-clone';",
"",
"var arr = [1, 2, 3];",
"var subObj = { aa: 1 };",
"var obj = { a: 3, b: 5, c: arr, d: subObj };",
"var objClone = clone(obj);",
"arr.push(4);",
"objClone.d.bb = 2;",
"obj; // {a: 3, b: 5, c: [1, 2, 3, 4], d: {aa: 1}}",
"objClone; // {a: 3, b: 5, c: [1, 2, 3], d: {aa: 1, bb: 2}}"
]
},
"just-compare": {
"packageName": "just-compare",
"dir": "collection-compare",
"description": "Compare two collections",
"examples": [
"import compare from 'just-compare';",
"",
"// primitives: value1 === value2",
"// functions: value1.toString == value2.toString",
"// arrays: if length, sequence and values of properties are identical",
"// objects: if length, names and values of properties are identical",
"compare([1, [2, 3]], [1, [2, 3]]); // true",
"compare([1, [2, 3], 4], [1, [2, 3]]); // false",
"compare({a: 2, b: 3}, {a: 2, b: 3}); // true",
"compare({a: 2, b: 3}, {b: 3, a: 2}); // true",
"compare({a: 2, b: 3, c: 4}, {a: 2, b: 3}); // false",
"compare({a: 2, b: 3}, {a: 2, b: 3, c: 4}); // false",
"compare([1, [2, {a: 4}], 4], [1, [2, {a: 4}]]); // false",
"compare([1, [2, {a: 4}], 4], [1, [2, {a: 4}], 4]); // true",
"compare(NaN, NaN); // true"
]
},
"just-diff": {
"packageName": "just-diff",
"dir": "collection-diff",
"description": [
"Return an object representing the difference between two other objects",
"Pass converter to format as http://jsonpatch.com"
],
"examples": [
"import {diff} from 'just-diff';",
"",
"const obj1 = {a: 4, b: 5};",
"const obj2 = {a: 3, b: 5};",
"const obj3 = {a: 4, c: 5};",
"",
"diff(obj1, obj2);",
"[",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 3 }",
"]",
"",
"diff(obj2, obj3);",
"[",
" { \"op\": \"remove\", \"path\": ['b'] },",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 4 }",
" { \"op\": \"add\", \"path\": ['c'], \"value\": 5 }",
"]",
"",
"// using converter to generate jsPatch standard paths",
"import {diff, jsonPatchPathConverter} from 'just-diff'",
"diff(obj1, obj2, jsonPatchPathConverter);",
"[",
" { \"op\": \"replace\", \"path\": '/a', \"value\": 3 }",
"]",
"",
"diff(obj2, obj3, jsonPatchPathConverter);",
"[",
" { \"op\": \"remove\", \"path\": '/b' },",
" { \"op\": \"replace\", \"path\": '/a', \"value\": 4 }",
" { \"op\": \"add\", \"path\": '/c', \"value\": 5 }",
"]",
"",
"// arrays",
"const obj4 = {a: 4, b: [1, 2, 3]};",
"const obj5 = {a: 3, b: [1, 2, 4]};",
"const obj6 = {a: 3, b: [1, 2, 4, 5]};",
"",
"diff(obj4, obj5);",
"[",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 3 }",
" { \"op\": \"replace\", \"path\": ['b', 2], \"value\": 4 }",
"]",
"",
"diff(obj5, obj6);",
"[",
" { \"op\": \"add\", \"path\": ['b', 3], \"value\": 5 }",
"]",
"",
"// nested paths",
"const obj7 = {a: 4, b: {c: 3}};",
"const obj8 = {a: 4, b: {c: 4}};",
"const obj9 = {a: 5, b: {d: 4}};",
"",
"diff(obj7, obj8);",
"[",
" { \"op\": \"replace\", \"path\": ['b', 'c'], \"value\": 4 }",
"]",
"",
"diff(obj8, obj9);",
"[",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 5 }",
" { \"op\": \"remove\", \"path\": ['b', 'c']}",
" { \"op\": \"add\", \"path\": ['b', 'd'], \"value\": 4 }",
"]"
]
},
"just-diff-apply": {
"packageName": "just-diff-apply",
"dir": "collection-diff-apply",
"description": "Apply a diff object to an object. Pass converter to apply a http://jsonpatch.com standard patch",
"examples": [
" import {diffApply} from 'just-diff-apply';",
"",
" const obj1 = {a: 3, b: 5};",
" diffApply(obj1,",
" [",
" { \"op\": \"remove\", \"path\": ['b'] },",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 4 },",
" { \"op\": \"add\", \"path\": ['c'], \"value\": 5 }",
" ]",
" );",
" obj1; // {a: 4, c: 5}",
"",
" const obj2 = {a: 3, b: 5};",
" diffApply(obj2,",
" [",
" { \"op\": \"move\", \"from\": ['a'], \"path\": ['c']},",
" ]",
" );",
" obj2; // {b: 5, c: 3}",
"",
" // using converter to apply jsPatch standard paths",
" // see http://jsonpatch.com",
" import {diffApply, jsonPatchPathConverter} from 'just-diff-apply'",
" const obj3 = {a: 3, b: 5};",
" diffApply(obj3, [",
" { \"op\": \"remove\", \"path\": '/b' },",
" { \"op\": \"replace\", \"path\": '/a', \"value\": 4 }",
" { \"op\": \"add\", \"path\": '/c', \"value\": 5 }",
" ], jsonPatchPathConverter);",
" obj3; // {a: 4, c: 5}",
"",
" // arrays (array key can be string or numeric)",
" const obj4 = {a: 4, b: [1, 2, 3]};",
" diffApply(obj4, [",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 3 }",
" { \"op\": \"replace\", \"path\": ['b', 2], \"value\": 4 }",
" { \"op\": \"add\", \"path\": ['b', 3], \"value\": 9 }",
" ]);",
" obj4; // {a: 3, b: [1, 2, 4, 9]}",
"",
" // nested paths",
" const obj5 = {a: 4, b: {c: 3}};",
" diffApply(obj5, [",
" { \"op\": \"replace\", \"path\": ['a'], \"value\": 5 }",
" { \"op\": \"remove\", \"path\": ['b', 'c']}",
" { \"op\": \"add\", \"path\": ['b', 'd'], \"value\": 4 }",
" ]);",
" obj5; // {a: 5, b: {d: 4}}"
]
},
"just-flush": {
"packageName": "just-flush",
"dir": "collection-flush",
"description": "Returns a copy of an array or object with null/undefined members removed",
"examples": [
"import flush from 'just-flush';",
"",
"flush([1, undefined, 2, null, 3, NaN, 0]); // [1, 2, 3, NaN, 0]",
"flush([true, null, false, true, [null], undefined]); // [true, false, true, [null]]",
"flush({a: 2, b: null, c: 4, d: undefined}); // {a: 2, c: 4}",
"flush('something'); // undefined",
"flush(); // undefined"
]
},
"just-pluck-it": {
"packageName": "just-pluck-it",
"dir": "collection-pluck",
"description": "Pluck a property from each member of a collection",
"examples": [
"import pluck from 'just-pluck-it';",
"",
"pluck([{a:1, b:2}, {a:4, b:3}, {a:2, b:5}], 'a'); // [1, 4, 2]",
"pluck({x: {a:1, b:2}, y: {a:4, b:3}, z: {a:2, b:5}}, 'a'); // {x: 1, y: 4, z: 2}"
]
},
"just-compose": {
"packageName": "just-compose",
"dir": "function-compose",
"description": "Return a function composed of 2 or more functions",
"examples": [
"import compose from 'just-compose';",
"",
"const sqRootBiggest = compose(Math.max, Math.sqrt, Math.trunc);",
"sqRootBiggest(10, 5); // 3",
"sqRootBiggest(7, 0, 16); // 4"
]
},
"just-curry-it": {
"packageName": "just-curry-it",
"dir": "function-curry",
"description": "Return a curried function",
"examples": [
"import curry from 'just-curry-it';",
"",
"function add(a, b, c) {",
" return a + b + c;",
"}",
"curry(add)(1)(2)(3); // 6",
"curry(add)(1)(2)(2); // 5",
"curry(add)(2)(4, 3); // 9",
"",
"function add(...args) {",
" return args.reduce((sum, n) => sum + n, 0)",
"}",
"var curryAdd4 = curry(add, 4)",
"curryAdd4(1)(2, 3)(4); // 10",
"",
"function converter(ratio, input) {",
" return (input*ratio).toFixed(1);",
"}",
"const curriedConverter = curry(converter)",
"const milesToKm = curriedConverter(1.62);",
"milesToKm(35); // 56.7",
"milesToKm(10); // 16.2"
]
},
"just-debounce-it": {
"packageName": "just-debounce-it",
"dir": "function-debounce",
"description": "Return a debounced function",
"examples": [
"import debounce from \"just-debounce-it\";",
"",
"const fn1 = debounce(() => console.log(\"Hello\"), 500);",
"fn1();",
"fn1();",
"fn1();",
"// 500ms later logs 'hello' once",
"",
"const fn2 = debounce(() => console.log(\"Hello\"), 500, true);",
"fn2(); // logs hello immediately",
"fn2();",
"fn2();",
"// 500ms later logs 'hello' once",
"",
"const fn3 = debounce(() => console.log(\"Hello\"), 500);",
"fn3();",
"fn3();",
"fn3();",
"fn3.cancel();",
"// function cancelled before 'hello' is logged",
"",
"const fn4 = debounce(() => console.log(\"Hello\"), 500);",
"fn4();",
"fn4();",
"fn4();",
"fn4.flush();",
"// immediately invoke the debounced function"
]
},
"just-demethodize": {
"packageName": "just-demethodize",
"dir": "function-demethodize",
"description": "Turn a method into a standalone function; the first arg becomes `this`",
"examples": [
"import demethodize from 'just-demethodize';",
"",
"const trimFn = demethodize(''.trim);",
"['hello ', ' goodbye', 'hello again'].map(trimFn); // ['hello', 'goodbye', 'hello again']"
]
},
"just-flip": {
"packageName": "just-flip",
"dir": "function-flip",
"description": "Flip first two arguments of a function",
"examples": [
"import flip from 'just-flip';",
"",
"flip(console.log)(1, 2, 3) // 2, 1, 3",
"",
"import map from 'just-map-object';",
"import partial from 'just-partial';",
"",
"const numbers = {x: 5, y: 10};",
"const flippedMap = flip(map);",
"const double = partial(flippedMap, (undefined, number) => number * 2);",
"double(numbers) // {x: 10, y: 20];"
]
},
"just-memoize": {
"packageName": "just-memoize",
"dir": "function-memoize",
"description": "An implementation of the memoize technique",
"examples": [
"import memoize from 'just-memoize';",
"",
"const sumByOne = memoize(function(value) {",
" return value + 1;",
"});",
"",
"sumByOne(10); // Returns value returned by the function",
"sumByOne(10); // Cache hit!",
"",
"sumByOne(20); // Returns value returned by the function",
"sumByOne(20); // Cache hit!",
"",
"// Custom cache key (key defaults to JSON stringified arguments)",
"var sum = memoize(function(a, b) {",
" return a + b;",
"}, function(a, b) {",
" return `${a}-${b}`;",
"});",
"",
"sum(10, 10); // Returns value returned by the function",
"sum(10, 20); // Returns value returned by the function",
"sum(10, 20); // Cache hit!"
]
},
"just-memoize-last": {
"packageName": "just-memoize-last",
"dir": "function-memoize-last",
"description": "A memoize implementation that only caches the most recent evaluation",
"examples": [
"const memoizeLast = require('just-memoize-last')",
"const compare = require('just-compare')",
"",
"const maxValue = memoizeLast(function(arr) {",
" return Math.max(...arr)",
"}, function(a, b) {",
" return compare(a, b)",
"});",
"",
"maxValue([1,2,3]) // 3",
"maxValue([1,2,3]) // cache hit!",
"maxValue([1,3,4]) // 4",
"maxValue([1,2,3]) // 3"
]
},
"just-once": {
"packageName": "just-once",
"dir": "function-once",
"description": "Create a function that can only be invoked once",
"examples": [
"import once from 'just-once';",
"",
"const fn = once(() => console.log('hello'));",
"",
"fn();",
"// logs 'hello'",
"fn();",
"// does nothing"
]
},
"just-partial-it": {
"packageName": "just-partial-it",
"dir": "function-partial",
"description": "Return a partial function",
"examples": [
"import partial from 'just-partial-it';",
"",
"const cubedRoot = partial(Math.pow, _, 1/3);",
"cubedRoot(64); // 4",
"",
"const getRoot = partial(Math.pow, 64);",
"getRoot(1/2); // 8"
]
},
"just-throttle": {
"packageName": "just-throttle",
"dir": "function-throttle",
"description": "Return a throttled function",
"examples": [
"import throttle from 'just-throttle';",
"",
"// no matter how many times the function is called, only invoke once within the given interval",
"// options: ",
"// `leading`: invoke before interval",
"// `trailing`: invoke afer interval",
"",
"const fn1 = throttle(() => console.log('hello'), 500, {leading: true});",
"setInterval(fn1, 400);",
"// logs 'hello' immediately and then every 500ms",
"",
"const fn2 = throttle(() => console.log('hello'), 500, {trailing: true});",
"setInterval(fn2, 400);",
"// logs 'hello' after 500ms and then every 500ms",
"",
"const fn3 = throttle(() => console.log('hello'), 500, {leading: true, trailing: true});",
"// forces trailing to false",
"",
"const fn4 = throttle(() => console.log('hello'), 500, { leading: false });",
"fn4();",
"fn4();",
"fn4();",
"fn4.cancel();",
"// function cancelled before 'hello' is logged",
"",
"const fn5 = throttle(() => console.log(\"Hello\"), 500);",
"fn5();",
"fn5();",
"fn5();",
"fn5.flush();",
"// immediately invoke the throttled function"
]
},
"just-clamp": {
"packageName": "just-clamp",
"dir": "number-clamp",
"description": "Restrict a number within a range",
"examples": [
"import clamp from 'just-clamp';",
"",
"var n = 5;",
"clamp(1, n, 12); // 5",
"clamp(3, n, 1); // 3",
"clamp(8, n, 9); // 8",
"clamp(0, n, 0); // 0",
"",
"var n = -5;",
"clamp(1, n, 12); // 1",
"clamp(-7, n, -8); // -7",
"",
"clamp(NaN, n, 8); // NaN",
"clamp(3, n, NaN); // NaN ",
"clamp(3, NaN, 8); // NaN ",
"",
"clamp(undefined, n, 8); // throws",
"clamp(3, n, 'h'); // throws ",
"clamp(3, false, 8); // throws "
]
},
"just-in-range": {
"packageName": "just-in-range",
"dir": "number-in-range",
"description": "Check if number is within a given range",
"examples": [
" import inRange from 'just-number-in-range'",
"",
"/*",
" inRange(2, 1, 10); // true",
" inRange(15, 20); // true",
" inRange(20, 21, 30); // false",
" inRange(30, 21, 30); // false",
" inRange(); // throws",
" inRange(100); // throws",
" inRange(\"js\"); // throws",
"*/"
]
},
"just-is-prime": {
"packageName": "just-is-prime",
"dir": "number-is-prime",
"description": "Check if number is prime",
"examples": [
" import isPrime from 'just-is-prime;",
"",
"/*",
" isPrime(1); // false",
" isPrime(2); // true",
" isPrime(17); // true",
" isPrime(10); // false",
" isPrime(); // throws",
" isPrime(null); // throws",
" isPrime(\"js\"); // throws",
" isPrime({}); // throws",
" isPrime(function() {}); // throws",
" isPrime([]); // throws",
"*/"
]
},
"just-modulo": {
"packageName": "just-modulo",
"dir": "number-modulo",
"description": "Modulo of a number and a divisor",
"examples": [
"import modulo from 'just-modulo';",
"",
"modulo(7, 5); // 2",
"modulo(17, 23); // 17",
"modulo(16.2, 3.8); // 1",
"modulo(5.8, 3.4); //2.4",
"modulo(4, 0); // 4",
"modulo(-7, 5); // 3",
"modulo(-2, 15); // 13",
"modulo(-5.8, 3.4); // 1",
"modulo(12, -1); // NaN",
"modulo(-3, -8); // NaN",
"modulo(12, 'apple'); // NaN",
"modulo('bee', 9); // NaN",
"modulo(null, undefined); // NaN"
]
},
"just-random-integer": {
"packageName": "just-random-integer",
"dir": "number-random-integer",
"description": "Produces a random integer within a given range",
"examples": [
"import random from 'just-random-integer';",
"",
"random();",
"// Returns either 0 or 1",
"random(5);",
"// Returns a random integer between 0 and 5 (inclusively)",
"random(3, 10);",
"// Returns a random integer between 3 and 10 (inclusively)",
"random(-5.8, 10.4);",
"// Returns a random integer between -5 and 10 (inclusively)"
]
},
"just-entries": {
"packageName": "just-entries",
"dir": "object-entries",
"description": "Return object entries as an array of [key, value] pairs",
"examples": [
"import entries from 'just-entries';",
"",
"// Object:",
"entries({c: 8, a: 4}); // [['c', 8], ['a', 4]]",
"entries({b: {bb: 4}, a: {aa: 2}}); // [['b', {bb: 4}], ['a', {aa: 2}]]",
"entries({}); // []",
"",
"// Array:",
"entries([{c: 8}, {a: 4}]); // [[0, {c: 8}], [1, {a: 4}]]",
"entries(['À', 'mauvais', 'ouvrier', 'point', 'de', 'bon', 'outil'])",
"// [[0, 'À'], [1, 'mauvais'] ... [6, 'outil']]",
"entries([]); // []"
]
},
"just-extend": {
"packageName": "just-extend",
"dir": "object-extend",
"description": "Extend an object",
"examples": [
"import extend from 'just-extend';",
"",
"var obj = {a: 3, b: 5};",
"extend(obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}",
"obj; // {a: 4, b: 5, c: 8}",
"",
"var obj = {a: 3, b: 5};",
"extend({}, obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}",