Property assignment doesn't work

Asked Jul 20 '16 at 12:43

Active Jul 20 '16 at 12:55

Viewed 35 times

I'm quite new to Javascript and I feel like I am missing something about assignments. I have a variable "users" of type "SQLResultSetRowList" which is actually the result of a SELECT SQL request and that represents the users of my application (I'm working with Phonegap if that's of any relevance).

When I do

users.item(0).name = "foo";

It doesn't actually change the property name of my first user to "foo", it remains the same. It also returns "foo" (which is normal I think).

I found a solution that consist in "copying" the object

var newObj = {id: users.item(0).id, ... , name: users.item(0).name};
newObj.name = "foo";

but it feels really dirty. Could you tell me what I am doing wrong?

Thanks in advance.

asked Jul 20 '16 at 12:43

Bert.e

Use square bracket users.item[0].name = "foo"; – Nitin Dhomse Jul 20 '16 at 12:45
@NitinDhomse is that a guess or...? The [docs](https://cordova.apache.org/docs/en/2.7.0/cordova/storage/sqlresultsetrowlist/sqlresultsetrowlist.html) specify `To get a row of data you would call the item method specifying an index` – Jamiec Jul 20 '16 at 12:48
What is the data type of `users`? Is it an array? It looks like `item` is a method that returns another object of type `users` which also has a property `name` in it. – Divyanth Jayaraj Jul 20 '16 at 12:53
@Jamiec sorry, I thought its a javascript object. – Nitin Dhomse Jul 20 '16 at 12:54
You need to make a copy and alter the copy. – epascarello Jul 20 '16 at 12:59
@epascarello That's what I did but I don't understand why I have to do that. It feels really dirty – Bert.e Jul 20 '16 at 13:01
1

Because it is immutable – epascarello Jul 20 '16 at 13:02
Ok, thanks for the answer. Just saw the duplicate label over my question. Too bad I didn't find it earlier. Have a nice day. – Bert.e Jul 20 '16 at 13:06

Property assignment doesn't work

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