JAVASCRIPT

how to check if an element is in an array javascript

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.includes("Mango");

how to check if item is in list js

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

how to check if an element is in array javascript

array.includes('element that need to be checked') //returns true or false 

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.