27 lines
792 B
Markdown
27 lines
792 B
Markdown
---
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title: pull
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tags: array,intermediate
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firstSeen: 2017-12-17T16:41:31+02:00
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lastUpdated: 2020-10-22T20:24:04+03:00
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---
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Mutates the original array to filter out the values specified.
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- Use `Array.prototype.filter()` and `Array.prototype.includes()` to pull out the values that are not needed.
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- Set `Array.prototype.length` to mutate the passed in an array by resetting its length to `0`.
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- Use `Array.prototype.push()` to re-populate it with only the pulled values.
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```js
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const pull = (arr, ...args) => {
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let argState = Array.isArray(args[0]) ? args[0] : args;
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let pulled = arr.filter(v => !argState.includes(v));
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arr.length = 0;
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pulled.forEach(v => arr.push(v));
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};
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```
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```js
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let myArray = ['a', 'b', 'c', 'a', 'b', 'c'];
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pull(myArray, 'a', 'c'); // myArray = [ 'b', 'b' ]
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```
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