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Fix typo to fit the context Fix typo add space Fix small typo Fix small typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Update tail.md Fix typo Fix small typo Fix typo Fix typo Fix typo Fix typo Fix small typo Fix typo Fix small typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo Fix typo
25 lines
838 B
Markdown
25 lines
838 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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// 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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