From d6f19e4acbe20de2c00d29542b23242023bd04ac Mon Sep 17 00:00:00 2001 From: Rohit Tanwar Date: Sat, 6 Jan 2018 13:54:37 +0530 Subject: [PATCH] indexesOf --- snippets/indexesOf.md | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 snippets/indexesOf.md diff --git a/snippets/indexesOf.md b/snippets/indexesOf.md new file mode 100644 index 000000000..3b71bbb83 --- /dev/null +++ b/snippets/indexesOf.md @@ -0,0 +1,13 @@ +### indexesOf + +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` + +``` js +const indexesOf = (arr, val) => { + let indexes = [], i; + for(i = 0; i < arr.length; i++) + if (arr[i] === val) + indexes.push(i); + return indexes.length === 0 ? -1 : indexes.length === 1 indexes.pop() : indexes +} +```