javascript string contains substring

var str = "Hello world, welcome to the universe.";
var n = str.includes("world");

var str = "Hello world, welcome to the universe.";

var n = str.includes("world");
 

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

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

var str = "Hello world, welcome to the universe.";
var n = str.includes("world");
 

var str = "Hello world, welcome to the universe.";

var n = str.includes("world", 12);
 

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

console.log(string.indexOf(substring) !== -1);