27 lines
834 B
Markdown
27 lines
834 B
Markdown
### pullAtIndex
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Mutates the original array to filter out the values at the specified indexes.
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Use `Array.filter()` and `Array.includes()` to pull out the values that are not needed.
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Use `Array.length = 0` to mutate the passed in an array by resetting it's length to zero and `Array.push()` to re-populate it with only the pulled values.
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Use `Array.push()` to keep track of pulled values
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```js
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const pullAtIndex = (arr, pullArr) => {
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let removed = [];
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let pulled = arr.map((v, i) => pullArr.includes(i) ? removed.push(v) : v)
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.filter((v, i) => !pullArr.includes(i))
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arr.length = 0;
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pulled.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 = pullAtIndex(myArray, [1, 3]);
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console.log(myArray); // [ 'a', 'c' ]
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console.log(pulled); // [ 'b', 'd' ]
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```
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