if text contains js 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 contais

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

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

Example 3: angular string contains

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

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