How to find an item in an array

find_item_in_array.js

function item_in_array(){
 var fruits = ["Bob", "Rob", "Amanda", "Cheryl","Susan"];
 
  
  Logger.log(fruits.indexOf("Susan")) //returns 4 which is the index of Susan
  Logger.log(fruits.indexOf("Frank")) //returns -1 since the item is not found
  
}