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---
id: 579e2a2c335b9d72dd32e05c
title: Slice and Splice
isRequired: true
isBeta: true
challengeType: 5
videoUrl: ''
localeTitle: 切片和拼接
---
## Description
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< section id = "description" > 您将获得两个数组和一个索引。使用数组方法< code > slice< / code > 和< code > splice< / code > 按顺序将第一个数组的每个元素复制到第二个数组中。开始在第二个数组的索引< code > n< / code > 处插入元素。返回结果数组。函数运行后，输入数组应保持不变。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 > 。编写自己的代码。 < / section >
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## Instructions
< section id = "instructions" >
< / section >
## Tests
< section id = 'tests' >
```yml
tests:
- text: '< code > frankenSplice([1, 2, 3], [4, 5], 1)</ code > 应该返回< code > [4, 1, 2, 3, 5]</ code > < code > frankenSplice([1, 2, 3], [4, 5], 1)</ code > < code > [4, 1, 2, 3, 5]</ code > 。'
testString: 'assert.deepEqual(frankenSplice([1, 2, 3], [4, 5], 1), [4, 1, 2, 3, 5], "< code > frankenSplice([1, 2, 3], [4, 5], 1)< / code > should return < code > [4, 1, 2, 3, 5]< / code > .");'
- text: '< code > frankenSplice([1, 2], [" a" , " b" ], 1)</ code > 应返回< code > [" a" , 1, 2, " b" ]</ code > 。'
testString: 'assert.deepEqual(frankenSplice(testArr1, testArr2, 1), ["a", 1, 2, "b"], "< code > frankenSplice([1, 2], ["a", "b"], 1)< / code > should return < code > ["a", 1, 2, "b"]< / code > .");'
- text: '< code > frankenSplice([" claw" , " tentacle" ], [" head" , " shoulders" , " knees" , " toes" ], 2)</ code > 应该返回< code > [" head" , " shoulders" , " claw" , " tentacle" , " knees" , " toes" ]</ code > 。'
testString: 'assert.deepEqual(frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2), ["head", "shoulders", "claw", "tentacle", "knees", "toes"], "< code > frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)< / code > should return < code > ["head", "shoulders", "claw", "tentacle", "knees", "toes"]< / code > .");'
- text: 第一个数组中的所有元素都应按原始顺序添加到第二个数组中。
testString: 'assert.deepEqual(frankenSplice([1, 2, 3, 4], [], 0), [1, 2, 3, 4], "All elements from the first array should be added to the second array in their original order.");'
- text: 函数运行后，第一个数组应保持不变。
testString: 'assert(testArr1[0] === 1 & & testArr1[1] === 2, "The first array should remain the same after the function runs.");'
- text: 函数运行后，第二个数组应保持不变。
testString: 'assert(testArr2[0] === "a" & & testArr2[1] === "b", "The second array should remain the same after the function runs.");'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
function frankenSplice(arr1, arr2, n) {
// It's alive. It's alive!
return arr2;
}
frankenSplice([1, 2, 3], [4, 5, 6], 1);
```
< / div >
### After Test
< div id = 'js-teardown' >
```js
console.info('after the test');
```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
// solution required
```
< / section >
