2018-10-10 18:03:03 -04:00
---
id: a5de63ebea8dbee56860f4f2
title: Diff Two Arrays
isRequired: true
challengeType: 5
videoUrl: ''
localeTitle: 差分两个阵列
---
## Description
2019-11-19 19:54:48 -05:00
< section id = "description" > 比较两个数组并返回一个新数组，其中只有在两个给定数组中的一个中找到的任何项，但不能同时返回两个数组。换句话说，返回两个数组的对称差异。如果卡住，请记得使用< a href = "https://www.freecodecamp.org/forum/t/how-to-get-help-when-you-are-stuck-coding/19514" target = "_blank" > Read-Search-Ask< / a > 。尝试配对程序。编写自己的代码。 < strong > 注意< / strong > < br > 您可以按任何顺序返回包含其元素的数组。 < / section >
2018-10-10 18:03:03 -04:00
## Instructions
< section id = "instructions" >
< / section >
## Tests
< section id = 'tests' >
```yml
tests:
- text: '< code > diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5])</ code > 应该返回一个数组。'
testString: 'assert(typeof diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]) === "object", "< code > diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5])< / code > should return an array.");'
- text: '< code > [" diorite" , " andesite" , " grass" , " dirt" , " pink wool" , " dead shrub" ], [" diorite" , " andesite" , " grass" , " dirt" , " dead shrub" ]</ code > 应该返回< code > [" pink wool" ]</ code > 。'
testString: 'assert.sameMembers(diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]), ["pink wool"], "< code > ["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]< / code > should return < code > ["pink wool"]< / code > .");'
- text: '< code > [" diorite" , " andesite" , " grass" , " dirt" , " pink wool" , " dead shrub" ], [" diorite" , " andesite" , " grass" , " dirt" , " dead shrub" ]</ code > 应该返回一个包含一个项目的数组。'
testString: 'assert(diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]).length === 1, "< code > ["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]< / code > should return an array with one item.");'
- text: '< code > [" andesite" , " grass" , " dirt" , " pink wool" , " dead shrub" ], [" diorite" , " andesite" , " grass" , " dirt" , " dead shrub" ]</ code > 应该返回< code > [" diorite" , " pink wool" ]</ code > 。'
testString: 'assert.sameMembers(diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]), ["diorite", "pink wool"], "< code > ["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]< / code > should return < code > ["diorite", "pink wool"]< / code > .");'
- text: '< code > [" andesite" , " grass" , " dirt" , " pink wool" , " dead shrub" ], [" diorite" , " andesite" , " grass" , " dirt" , " dead shrub" ]</ code > 应该返回一个数组有两个项目。'
testString: 'assert(diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]).length === 2, "< code > ["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]< / code > should return an array with two items.");'
- text: '< code > [" andesite" , " grass" , " dirt" , " dead shrub" ], [" andesite" , " grass" , " dirt" , " dead shrub" ]</ code > 应该返回< code > []</ code > 。'
testString: 'assert.sameMembers(diffArray(["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]), [], "< code > ["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]< / code > should return < code > []< / code > .");'
- text: '< code > [" andesite" , " grass" , " dirt" , " dead shrub" ], [" andesite" , " grass" , " dirt" , " dead shrub" ]</ code > 应返回一个空数组。'
testString: 'assert(diffArray(["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]).length === 0, "< code > ["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]< / code > should return an empty array.");'
- text: '< code > [1, 2, 3, 5], [1, 2, 3, 4, 5]</ code > 应该返回< code > [4]</ code > 。'
testString: 'assert.sameMembers(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]), [4], "< code > [1, 2, 3, 5], [1, 2, 3, 4, 5]< / code > should return < code > [4]< / code > .");'
- text: '< code > [1, 2, 3, 5], [1, 2, 3, 4, 5]</ code > 应该返回一个带有一个项目的数组。'
testString: 'assert(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]).length === 1, "< code > [1, 2, 3, 5], [1, 2, 3, 4, 5]< / code > should return an array with one item.");'
- text: '< code > [1, " calf" , 3, " piglet" ], [1, " calf" , 3, 4]</ code > 应返回< code > [" piglet" , 4]</ code > 。'
testString: 'assert.sameMembers(diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]), ["piglet", 4], "< code > [1, "calf", 3, "piglet"], [1, "calf", 3, 4]< / code > should return < code > ["piglet", 4]< / code > .");'
- text: '< code > [1, " calf" , 3, " piglet" ], [1, " calf" , 3, 4]</ code > 应该返回一个包含两个项目的数组。'
testString: 'assert(diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]).length === 2, "< code > [1, "calf", 3, "piglet"], [1, "calf", 3, 4]< / code > should return an array with two items.");'
- text: '< code > [], [" snuffleupagus" , " cookie monster" , " elmo" ]</ code > 应该返回< code > [" snuffleupagus" , " cookie monster" , " elmo" ]</ code > 。'
testString: 'assert.sameMembers(diffArray([], ["snuffleupagus", "cookie monster", "elmo"]), ["snuffleupagus", "cookie monster", "elmo"], "< code > [], ["snuffleupagus", "cookie monster", "elmo"]< / code > should return < code > ["snuffleupagus", "cookie monster", "elmo"]< / code > .");'
- text: '< code > [], [" snuffleupagus" , " cookie monster" , " elmo" ]</ code > 应该返回一个包含三个项目的数组。'
testString: 'assert(diffArray([], ["snuffleupagus", "cookie monster", "elmo"]).length === 3, "< code > [], ["snuffleupagus", "cookie monster", "elmo"]< / code > should return an array with three items.");'
- text: '< code > [1, " calf" , 3, " piglet" ], [7, " filly" ]</ code > < code > [1, " calf" , 3, " piglet" , 7, " filly" ]</ code > < code > [1, " calf" , 3, " piglet" ], [7, " filly" ]</ code > 应该返回< code > [1, " calf" , 3, " piglet" , 7, " filly" ]</ code > 。'
testString: 'assert.sameMembers(diffArray([1, "calf", 3, "piglet"], [7, "filly"]), [1, "calf", 3, "piglet", 7, "filly"], "< code > [1, "calf", 3, "piglet"], [7, "filly"]< / code > should return < code > [1, "calf", 3, "piglet", 7, "filly"]< / code > .");'
- text: '< code > [1, " calf" , 3, " piglet" ], [7, " filly" ]</ code > 应该返回一个包含六个项目的数组。'
testString: 'assert(diffArray([1, "calf", 3, "piglet"], [7, "filly"]).length === 6, "< code > [1, "calf", 3, "piglet"], [7, "filly"]< / code > should return an array with six items.");'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
function diffArray(arr1, arr2) {
var newArr = [];
// Same, same; but different.
return newArr;
}
diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]);
```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
// solution required
```
< / section >
