index Of
Get the index (position) of the first element in the array that matches a search item.
["hello"].indexOf("hello")
Parameters
- item: the item to find somewhere in the array.
- from: a 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 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.
let movieSnacks = ["mints", "cola", "pretzel", "popcorn", "peanuts"];
let popcorn = movieSnacks.indexOf("popcorn");