JAVASCRIPT

how to check data type of javascript variable

let counter = 120; // counter is a number
console.log(typeof(counter)); // "number"

counter = false;   // counter is now a boolean
console.log(typeof(counter)); // "boolean"

counter = "Hi";   // counter is now a string
console.log(typeof(counter)); // "string"Code language: JavaScript (javascript)

check data type in js

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

data type in javascript

var age = 18;                           // number 
var name = "Jane";                      // string
var name = {first:"Jane", last:"Doe"};  // object
var truth = false;                      // boolean
var sheets = ["HTML","CSS","JS"];       // array
var a; typeof a;                        // undefined
var a = null;                           // value null

check data type in js

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

js check data type

typeof(variable)

check data type in js

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