check is an item is in list javascript code example

Example 1: how to check if item is in list js

var myList=["a", "b", "c"];
mylist.includes("d")//returns true or false

Example 2: is value in list javascript

function inListBoolean(list, item){
    var boolean = false
    list.forEach(value => {
        if(value == item){
            boolean = true
        }
    })
    return boolean;
}