Answers for "how to get datatype of variable in javascript"

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

javascript find type of variable

> typeof "foo"
"string"
> typeof true
"boolean"
> typeof 42
"number"

if(typeof bar === 'number') {
   //whatever
}

check data type in javascript

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

javascript datatypes

dataTypes = {
    Numbers = 1,2,3, 100, 3.14
    Strings = 'Hello, World' "[email protected]
    Boolean = true / false
    Null = 'Explicitly set a variable with no Value'
    Undefined = 'For variable that have not yet been defined'
    Object = 'Complex data structures - Arrays, Dates, Literals etc'
    Symbol = 'Used with objects' // usually not needed
}

javascript datatype

let length = 16;                               // Number

let lastName = "Johnson";                      // String

let x = {firstName:"John", lastName:"Doe"};    // Object