JavaScript

detect Types & Properties

How to Detect?

• Primitive types
• Custom types
• Array
• Function
• Properties in Object

Primitive types

Number, Boolean, String

Null, Undefined

Custom types

function Car(){

this.run="booboo";

}

Array

function isArray(arr){

arr.length ?

???

}

Function

function isFunction(arr){ ?

???

}

Properties in Object

Is that correct?

if(obj.prop)

if(obj.prop == true)

if(typeof obj.prop === "undefined")

Text