javascript + contains string code example

Example 1: check if string contains javascript

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

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

Example 2: js string contains

'Bandeira do Brasil'.includes('brasil'); // retorna false

Example 3: js string contains

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

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