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Tag Archives: typeof


Before reading this blog entry, please have a quick look at my earlier blog entry null typeof shock.

In the earlier blog (null typeof shock), using typeof operator returns misleading value object.

To make it clear,

var myArr = Array();  // creating variable myArr and assigning a array into it
//var myArr = [];  // another way of doing it
alert(typeof(myArr));  // object, NOT array


So how do you make sure if a variable is given, it is an array?

Here comes instanceof operator to rescue.

alert(myArr instanceof Array) // true.

Well, don’t you feel strange to hear typeof and instanceof are operators!! Search and read about it then. In JavaScript you have lot of strange operators like this.


typeof
Array ‘object’
Function ‘function’
String ‘string’
Number ‘number’
Boolean ‘boolean’
null ‘object’
undefined 'undefined'