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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,43 +1,28 @@ | ||
| // helpers | ||
| let toString = Object.prototype.toString | ||
| let keys = Object.keys | ||
| let apply = (fn, args) => fn.apply(null, args) | ||
| let identity = x => x | ||
| let append = (item, list) => { list.push(item); return list } | ||
| let assoc = (obj, attr, val) => { obj[attr] = val; return obj } | ||
| let isArray = obj => toString.call(obj) === '[object Array]' | ||
|
|
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| // exports | ||
| export let reduce = (list = [], iterator = identity, ...rest) => { | ||
| let i = rest.length ? 0 : 1 | ||
| let acc = rest.length ? rest[0] : list[0] | ||
| let keyList = keys(list) | ||
| for (let len = keyList.length; i < len; i++) { | ||
| let key = keyList[i] | ||
| acc = apply(iterator, [acc, list[key], key, list]) | ||
| } | ||
| return acc | ||
| } | ||
|
|
||
| export let map = (list, iterator) => | ||
| reduce(list, (acc, value, i) => | ||
| append(apply(iterator, [value, i]), acc), []) | ||
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| export let each = (...args) => { apply(map, args) } | ||
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| export let pluck = (list, attr) => map(list, item => item[attr]) | ||
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| export let toArray = args => Array.prototype.slice.call(args) | ||
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| export let isArray = obj => Object.prototype.toString.call(obj) === '[object Array]' | ||
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| export let clone = obj => isArray(obj) ? obj.slice(0) : extend({}, obj) | ||
| export let clone = obj => | ||
| isArray(obj) | ||
| ? obj.slice(0) | ||
| : extend({}, obj) | ||
|
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||
| export let pick = (obj, attrs) => | ||
| reduce(attrs, (acc, attr) => | ||
| attrs.reduce((acc, attr) => | ||
| assoc(acc, attr, obj[attr]), {}) | ||
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| export let extend = (obj1, obj2) => | ||
| reduce(obj2 || {}, (__, value, key) => assoc(obj1, key, value), obj1 || {}) | ||
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| export let isEqual = (obj1, obj2) => | ||
| keys(obj1).length === keys(obj2).length && | ||
| reduce(obj1, (acc, value, key) => acc && obj2[key] === value, true) | ||
| keys(obj1).reduce((acc, key) => acc && obj2[key] === obj1[key], true) | ||
|
|
||
| export let extend = (obj, ...rest) => { | ||
| rest.forEach(source => { | ||
| if (source) { | ||
| for (var prop in source) { | ||
| obj[prop] = source[prop] | ||
| } | ||
| } | ||
| }) | ||
| return obj | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,22 +1,46 @@ | ||
| let {assert} = require('referee') | ||
| let {assert, refute} = require('referee') | ||
| let {suite, test} = window | ||
| let _ = require('../../lib/dash') | ||
| let {clone, pick, isEqual, extend} = require('../../lib/dash') | ||
|
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| suite('_') | ||
| suite('dash') | ||
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| test('map', () => { | ||
| assert.equals(_.map([1, 2, 3], i => i * 2), [2, 4, 6]) | ||
| test('clone arrays', () => { | ||
| let a = [1, 2, 3] | ||
| let b = clone(a) | ||
| b.push(4) | ||
| assert.equals(a, [1, 2, 3]) | ||
| assert.equals(b, [1, 2, 3, 4]) | ||
| }) | ||
|
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||
| test('clone objects', () => { | ||
| let a = {a: 1, b: 2} | ||
| let b = clone(a) | ||
| b.c = 3 | ||
| assert.equals(a, {a: 1, b: 2}) | ||
| assert.equals(b, {a: 1, b: 2, c: 3}) | ||
| }) | ||
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||
| test('pick', () => { | ||
| assert.equals(_.pick({a: 1, b: 2, c: 3}, ['a', 'c']), {a: 1, c: 3}) | ||
| assert.equals(pick({a: 1, b: 2, c: 3}, ['a', 'c']), {a: 1, c: 3}) | ||
| }) | ||
|
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| test('pluck', () => { | ||
| assert.equals(_.pluck([{a: 1, b: 2}, {a: 3, b: 4}], 'a'), [1, 3]) | ||
| test('isEqual', () => { | ||
| let arr = [] | ||
| assert(isEqual({a: 1, b: 2}, {a: 1, b: 2})) | ||
| assert(isEqual({a: 1, b: arr}, {a: 1, b: arr})) | ||
| refute(isEqual({a: 1, b: 2}, {a: 1, b: '2'})) | ||
| refute(isEqual({a: 1, b: 2}, {a: 1})) | ||
| refute(isEqual({a: 1, b: {c: 3}}, {a: 1, b: {c: 3}})) | ||
| }) | ||
|
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| test('isArray', () => { | ||
| assert.equals(_.isArray([]), true) | ||
| assert.equals(_.isArray({}), false) | ||
| test('extend', () => { | ||
| assert.equals(extend({}, {a: 1, b: 2}, null, {c: 3}), {a: 1, b: 2, c: 3}) | ||
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| let obj = {d: 4} | ||
| let target = {} | ||
| extend(target, obj) | ||
| target.a = 1 | ||
| obj.b = 2 | ||
| assert.equals(obj, {b: 2, d: 4}) | ||
| assert.equals(target, {a: 1, d: 4}) | ||
| }) |