if string in string js 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: js string contains

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

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

Example 4: if is a string javascript

function isString(x) {
  return Object.prototype.toString.call(x) === "[object String]"
}