searching sub strings from string in js code example

Example 1: if string javascript

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

Example 2: check for substring javascript

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

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

Example 3: js check if string contains character

if (your_string.indexOf('hello') > -1)
{
  alert("hello found inside your_string");
}