Get the index of the first matching item in an array

Get the index of the first matching item in an array. Returns -1 if no matching item is found.

var sandwiches = ['turkey', 'tuna', 'blt', 'pb&jb'];

// returns 1
sandwiches.indexOf('tuna');

// returns -1
sandwiches.indexOf('ham');

Source

https://vanillajstoolkit.com/reference/arrays/array-indexof.md/