how to checkt if a string exist javascript code example

Example 1: string contains in javascript

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

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

Example 2: includes in javascript

var colors = ['yellow', 'red', 'pink'];
var string = 'yellow and red are pretty cool';

// outputs false
console.log(colors.include('blue');
// outputs true
console.log(string.includes('yellow');