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Update pullAtValue.md

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Angelos Chalaris
2017-12-19 16:38:57 +02:00
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snippets/pullAtValue.md
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@ -1,6 +1,6 @@
### pullAtValue ### pullAtValue
This method is like pull except that it accepts an array of values to filter out before Mutating and pulling all the values from the original array. Which then returns an array of removed elements. Mutates the original array to filter out the values specified. Returns the removed elements.
Use `Array.filter()` and `Array.includes()` to pull out the values that are not needed. Use `Array.filter()` and `Array.includes()` to pull out the values that are not needed.
Use `Array.length = 0` to mutate the passed in array by resetting it's length to zero and `Array.push()` to re-populate it with only the pulled values. Use `Array.length = 0` to mutate the passed in array by resetting it's length to zero and `Array.push()` to re-populate it with only the pulled values.
@ -8,20 +8,17 @@ Use `Array.push()` to keep track of pulled values
```js ```js
const pullAtValue = (arr, pullArr) => { const pullAtValue = (arr, pullArr) => {
let removed = []; let removed = [],
let pushToRemove = arr.forEach((v, i) => pullArr.includes(v) ? removed.push(v) : v) pushToRemove = arr.forEach((v, i) => pullArr.includes(v) ? removed.push(v) : v),
let mutateTo = arr.filter((v, i) => !pullArr.includes(v)) mutateTo = arr.filter((v, i) => !pullArr.includes(v));
arr.length = 0; arr.length = 0;
mutateTo.forEach(v => arr.push(v)); mutateTo.forEach(v => arr.push(v));
return removed; return removed;
} }
/*
let myArray = ['a', 'b', 'c', 'd']; let myArray = ['a', 'b', 'c', 'd'];
let pulled = pullAtValue(myArray, ['b', 'd']); let pulled = pullAtValue(myArray, ['b', 'd']);
console.log(myArray); -> [ 'a', 'c' ]
// let myArray = ['a', 'b', 'c', 'd']; console.log(pulled); -> [ 'b', 'd' ]
// let pulled = pullAtValue(myArray, ['b', 'd']); */
// console.log(myArray); -> [ 'a', 'c' ]
// console.log(pulled); -> [ 'b', 'd' ]
``` ```