How to find type of variable name?

To find the type of variable name use typeof().



JavaScript typeof operator tells you what type of data you're dealing with: 



Example : 



var str1 = "This is a string"

var arr1 = new Array("This", "is", "a", "string");



alert(typeof(str1)); // shows 'string' in the message box

alert(typeof(arr1)); // shows 'object' in the message box