Difference Between for (i in ....) and for (i of ...)

JavaScript
1

Hi,

I just got stuck on a piece of code in a tutorial I’ve been working on.

It didn’t work when I wrote
for (item in data) {…

but it worked when I noticed that in the tutorial it stated
for (item of data) {…

Can anyone tell me what the difference is? I’ve tried searching online, but I can’t find much about it…

Btw, ‘data’ refers to some data in a SQL database. Not sure if that makes much difference or not… Is for (i of …) something only used when looping over a database?

Thanks in advance.

2

the values you get are different

iterating over an object one gives the keys the other the values

3

That’s great. Thanks :slight_smile:

4

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