freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-using-splice.md

---
id: 587d78b2367417b2b2512b10
title: Remove Items Using splice()
challengeType: 1
forumTopicId: 301166
dashedName: remove-items-using-splice
---

# --description--

Ok, so we've learned how to remove elements from the beginning and end of arrays using `shift()` and `pop()`, but what if we want to remove an element from somewhere in the middle? Or remove more than one element at once? Well, that's where `splice()` comes in. `splice()` allows us to do just that: **remove any number of consecutive elements** from anywhere in an array.

`splice()` can take up to 3 parameters, but for now, we'll focus on just the first 2. The first two parameters of `splice()` are integers which represent indexes, or positions, of the array that `splice()` is being called upon. And remember, arrays are *zero-indexed*, so to indicate the first element of an array, we would use `0`. `splice()`'s first parameter represents the index on the array from which to begin removing elements, while the second parameter indicates the number of elements to delete. For example:

```js
let array = ['today', 'was', 'not', 'so', 'great'];

array.splice(2, 2);
// remove 2 elements beginning with the 3rd element
// array now equals ['today', 'was', 'great']
```

`splice()` not only modifies the array it's being called on, but it also returns a new array containing the value of the removed elements:

```js
let array = ['I', 'am', 'feeling', 'really', 'happy'];

let newArray = array.splice(3, 2);
// newArray equals ['really', 'happy']
```

# --instructions--

We've initialized an array `arr`. Use `splice()` to remove elements from `arr`, so that it only contains elements that sum to the value of `10`.

# --hints--

You should not change the original line of `const arr = [2, 4, 5, 1, 7, 5, 2, 1];`.

```js
assert(
  __helpers.removeWhiteSpace(code).match(/constarr=\[2,4,5,1,7,5,2,1\];?/)
);
```

`arr` should only contain elements that sum to `10`.

```js
assert.strictEqual(
  arr.reduce((a, b) => a + b),
  10
);
```

Your code should utilize the `splice()` method on `arr`.

```js
assert(__helpers.removeWhiteSpace(code).match(/arr\.splice\(/));
```

The splice should only remove elements from `arr` and not add any additional elements to `arr`.

```js
assert(
  !__helpers.removeWhiteSpace(code).match(/arr\.splice\(\d+,\d+,\d+.*\)/g)
);
```

# --seed--

## --seed-contents--

```js
const arr = [2, 4, 5, 1, 7, 5, 2, 1];
// Only change code below this line

// Only change code above this line
console.log(arr);
```

# --solutions--

```js
const arr = [2, 4, 5, 1, 7, 5, 2, 1];
arr.splice(1, 4);
```