diff --git a/snippets/pullAtIndex.md b/snippets/pullAtIndex.md new file mode 100644 index 000000000..0e0d8cf7f --- /dev/null +++ b/snippets/pullAtIndex.md @@ -0,0 +1,24 @@ +### pullAtIndex + +Mutates the original array to filter out the values at the specified indexes. + +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 pullAtIndex = (arr, pullArr) => { + let removed = []; + let pulled = arr.map((v, i) => pullArr.includes(i) ? removed.push(v) : v) + .filter((v, i) => !pullArr.includes(i)) + arr.length = 0; + pulled.forEach(v => arr.push(v)); + return removed; +} + +// let myArray = ['a', 'b', 'c', 'd']; +// let pulled = pullAtIndex(myArray, [1, 3]); + +// console.log(myArray); -> [ 'a', 'c' ] +// console.log(pulled); -> [ 'b', 'd' ] +``` diff --git a/tag_database b/tag_database index 7e4b9f68d..89d7bc547 100644 --- a/tag_database +++ b/tag_database @@ -72,6 +72,7 @@ pipe:function powerset:math promisify:function pull:array +pullAtIndex:array pullAll:array randomIntegerInRange:math randomNumberInRange:math