// You can use the built-in method 'typeof' in order to check the variable datatype

​

//examples:

​

typeof "hello" // "string"

​

//or

var a = 1;

typeof(a);

//the output will be > 'number'

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)

typeof variable;

if (typeof i != "number") {

    console.log('This is not number');

}

> typeof "foo"

"string"

> typeof true

"boolean"

> typeof 42

"number"

​

let store = [1,2,3]; console.log(typeof store);

if(typeof variable == 'object'){

  //

}

> typeof "foo"

"string"

> typeof true

"boolean"

> typeof 42

"number"