How can I check if variable in java script is type of a particular object

Question

How can I check if variable in java script is type of a particular object? What will be the result of this

var myvalue = "200"+50+44;

possible duplicate of [Check whether variable is number or string in javascript](http://stackoverflow.com/questions/1303646/check-whether-variable-is-number-or-string-in-javascript) — Ja͢ck, Aug 30 '13 at 07:26

Praveen · Accepted Answer · 2013-08-30T07:41:37.883

2

1) The typeof operator returns a string indicating the type of the unevaluated operand.

2) The result will be 2005044

I think you're trying like this

parseInt("200", 10)+50+44 // returns 294

Check parseInt(string, radix) for more information.

edited Aug 30 '13 at 07:41

answered Aug 30 '13 at 07:21

Praveen

It's easy to get the wrong base with `parseInt` so it's advisable to define base as well, ie: `parseInt("200", 10)` (here base-10). – Aug 30 '13 at 07:37
@Ken-AbdiasSoftware Yes, you're right because there is chance of having **prefixed '0'(which is considered as octal)**. I missed it, I have updated it. Thank you for your pointers. – Praveen Aug 30 '13 at 07:41

score 0 · Answer 2 · answered Aug 30 '13 at 07:25

The type can be checked with the typeof operator.

typeof myvalue === "number"

The possible types are "number", "string", "object", "undefined". This has a few problems though.

The better way is compare constructors.

You do however need to check if it's null or undefined, because neither have a constructor property.

2 Answers2