check string in javascript code example

Example 1: if string javascript

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

Example 2: javascript string contains

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

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

Example 3: javascript string contains function

s = "Hello world";
console.log(s.includes("world"));

Example 4: javascript string includes

'Blue Whale'.includes('blue')  // returns false

Example 5: if is a string javascript

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