Comments on: How to better check data types in javascript

By: Mico

Mico — Tue, 05 Nov 2019 08:12:10 +0000

Excellent and useful article!!!

By: Zakaria

Zakaria — Wed, 28 Aug 2019 15:45:35 +0000

Very helpful indeed! Thanks a lot. A lot of these should have something in native in JS I think.

By: Suresh e

Suresh e — Sat, 29 Jun 2019 07:42:19 +0000

Thanks !!

By: Chad

Chad — Fri, 07 Sep 2018 16:52:22 +0000

If the function doesn't have side-effects, you can just call it and then test the return value. Since JavaScript isn't a strongly-typed language, there's no way of knowing what a function might return. It's possible a function could return different types depending on the input.

By: Kristian

Kristian — Thu, 06 Sep 2018 09:44:27 +0000

great overview, thanks for sharing!

I am trying to figure out if a function returns a string. But of course whenever I check typeof myCuteFunction it returns function of course.

Do you have an idea how to check which type a function returns?

regards
Kristian

By: Jay Jay

Jay Jay — Wed, 22 Aug 2018 16:55:02 +0000

Nice. How to check unknown type? Is there a simple one line of code to check?

By: Amit

Amit — Wed, 11 Jul 2018 07:49:32 +0000

This was very helpful. Thanks for giving me a handy guide on Javascript datatypes.

By: Rory

Rory — Thu, 07 Jun 2018 12:18:23 +0000

Awesome guide, thanks. It's great the JavaScript community is taking on board type checking now. Really like TypeScript for this but when writing in Vanilla not always so straight forward. typeof really doesn't do the job…

Shared on twitter :)

By: webbjocke

webbjocke — Tue, 29 May 2018 06:34:11 +0000

Yes you can actually, it might be a bit overkill when I think about it.

By: Saliman Uva

Saliman Uva — Mon, 28 May 2018 10:27:32 +0000

For regex checking, we can ignore this "typeof value === 'object'" checking, right? since it's as value.constructor type checking.