From ea867bcd2977542e6a1f1ce2238d09d0f7315172 Mon Sep 17 00:00:00 2001 From: King Date: Tue, 19 Dec 2017 01:06:29 -0500 Subject: [PATCH] add pullAtValue.md --- snippets/pullAtValue.md | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 snippets/pullAtValue.md diff --git a/snippets/pullAtValue.md b/snippets/pullAtValue.md new file mode 100644 index 000000000..e7b3fd44e --- /dev/null +++ b/snippets/pullAtValue.md @@ -0,0 +1,27 @@ +### 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. + +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.push()` to keep track of pulled values + +```js +const pullAtValue = (arr, pullArr) => { + let removed = []; + let pushToRemove = arr.forEach((v, i) => pullArr.includes(v) ? removed.push(v) : v) + let mutateTo = arr.filter((v, i) => !pullArr.includes(v)) + arr.length = 0; + mutateTo.forEach(v => arr.push(v)); + return removed; +} + +let myArray = ['a', 'b', 'c', 'd']; +let pulled = pullAtValue(myArray, ['b', 'd']); + +// let myArray = ['a', 'b', 'c', 'd']; +// let pulled = pullAtValue(myArray, ['b', 'd']); + +// console.log(myArray); -> [ 'a', 'c' ] +// console.log(pulled); -> [ 'b', 'd' ] +``` \ No newline at end of file