check for item in array 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: see if array contains array javascript

const found = arr1.some(r=> arr2.indexOf(r) >= 0)

Example 3: check items in array javascript

function checkAllEven(arr) {
  return arr.every(function(x){
	 return	x % 2 === 0
	})
}

//using "every" to check every item in array.