8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
24 lines
892 B
Markdown
24 lines
892 B
Markdown
### pullAtValue
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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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