pxt-core-own/common-docs/reference/arrays/index-of.md

Microsoft MakeCode, also known as Programming Experience Toolkit (PXT), provides Blocks / JavaScript tools and editors

# index Of

Get the index (position) of the first element in the array that matches a search item.

```sig
["hello"].indexOf("hello")
```

## Parameters

* **item**: the item to find somewhere in the array.
* **from**: a [number](/types/number) which is the position in the array to begin the search. You use this
if you want the search to start at someplace past `0`, the first position.

## Returns

* a [number](/types/number) which is the position in the array where the element is found. This number
is `-1` if a matching element isn't found anywhere in the array.

## Example

Get the index of "popcorn" in a list of movie treats.

```blocks
let movieSnacks = ["mints", "cola", "pretzel", "popcorn", "peanuts"];
let popcorn = movieSnacks.indexOf("popcorn");
```