Question

How to check if specified object is an instance of predefined specified object in JavaScript

Answer 1

var programming = ["JavaScript", "Java", "C#", "PHP"]; 

var b = programming instanceof Array;
document.write(b + "<br />");  

b = programming instanceof Object;
document.write(b + "<br />"); 

b = programming instanceof Number;
document.write(b + "<br />"); 

b = programming instanceof String;
document.write(b + "<br />"); 

 
/*
run:

true
true
false
false
 
*/

 

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