check if a substring is present in a given string javascript code example

Example 1: check for substring javascript

const string = "javascript";
const substring = "script";

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

Example 2: js string contais

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

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

Example 3: javascript contains 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)

Example 4: How to check whether a string contains a substring in JavaScript?

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