var fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango"); // true
var n = fruits.includes("Django"); // falsevar colors = ["red", "blue", "green"];
var hasRed = colors.includes("red"); //true
var hasYellow = colors.includes("yellow"); //falsevar myList=["a", "b", "c"];
mylist.includes("d")//returns true or falseconst ratings = [1,2,3,4,5];
let result = ratings.includes(4);
console.log(result); // true
result = ratings.includes(6);
console.log(result); // falsevar arr = ["name", "id"];
if (arr.indexOf("name") > -1) console.log('yeah');
else console.log('nah');Modern browsers have Array#includes, which does exactly that and is widely supported by everyone except IE:
console.log(['joe', 'jane', 'mary'].includes('jane')); //true