if string contains string javascript code example

Example 1: check if string contains javascript

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

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

Example 2: check for substring javascript

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

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

Example 3: check if word is in string javascript

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

Example 4: javascript string contains

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

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

Example 5: 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 6: string contains javascript

const s1 = 'javascript';
const s2 = 'python';

console.log(s1.includes('script')); // true
console.log(s2.includes('script')); // false