javascript string contains function

var string = "foo",
    substring = "oo";

console.log(string.includes(substring));s = "Hello world";
console.log(s.includes("world"));var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
	alert("Not again");
}
//use indexOf (it returns position of substring or -1 if not found)const pets = ['cat', 'dog', 'bat'];

console.log(pets.includes('cat'));
// output: true