From e05f516240e12cb42e5cba5fd7d85b413b5297fe Mon Sep 17 00:00:00 2001 From: Angelos Chalaris Date: Sat, 6 Jan 2018 13:44:51 +0200 Subject: [PATCH] Update indexOfAll.md --- snippets/indexOfAll.md | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/snippets/indexOfAll.md b/snippets/indexOfAll.md index fb636aecf..d453e8a5f 100644 --- a/snippets/indexOfAll.md +++ b/snippets/indexOfAll.md @@ -1,6 +1,9 @@ ### indexOfAll -Returns an array of indexes at which the `val` occurs in `arr`. If it occurs only once return the `index` and if it never occurs returns `-1` +Returns all indices of `val` in an array. If `val` never occurs, returns `[-1]`. + +Use `Array.forEach()` to loop over elements and `Array.push()` to store indices for matching elements. +Return `[-1]` if `length` of the array of indices is `0`, otherwise return the array of indices. ``` js const indexOfAll = (arr, val) => { @@ -10,9 +13,8 @@ const indexOfAll = (arr, val) => { }; ``` + ``` js -indexOfAll([1,2,3],1); // [0] indexOfAll([1,2,3,1,2,3],1); // [0,3] indexOfAll([1,2,3],4); // [-1] -indexOfAll([[1,2,3]],[1,2,3]); // [-1] (Array.prototype.indexOf()) has the same behaviour ```