if typeof x === number javascript class code example

Example 1: check data type in javascript

typeof("string"); //string
typeof(123); //number

Example 2: check data type in js

typeof("iAmAString");//This should return 'string'
//NO camelCase, as it is a JS Keyword

Example 3: check data type in js

var x = "Hello World";
typeof x; // "string"