js if in string code example

Example 1: if string javascript

if (typeof myVar === 'string') { /* code */ };

Example 2: check if string contains javascript

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

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

Example 3: check for substring javascript

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

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