27 lines
930 B
Markdown
27 lines
930 B
Markdown
---
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title: pullAtValue
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tags: array,advanced
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---
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Mutates the original array to filter out the values specified. Returns the removed elements.
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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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- Use `Array.prototype.length = 0` to mutate the passed in an array by resetting it's length to zero and `Array.prototype.push()` to re-populate it with only the pulled values.
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- Use `Array.prototype.push()` to keep track of pulled values
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```js
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const pullAtValue = (arr, pullArr) => {
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let removed = [],
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pushToRemove = arr.forEach((v, i) => (pullArr.includes(v) ? removed.push(v) : v)),
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mutateTo = arr.filter((v, i) => !pullArr.includes(v));
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arr.length = 0;
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mutateTo.forEach(v => arr.push(v));
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return removed;
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};
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```
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```js
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let myArray = ['a', 'b', 'c', 'd'];
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let pulled = pullAtValue(myArray, ['b', 'd']); // myArray = [ 'a', 'c' ] , pulled = [ 'b', 'd' ]
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```
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