Set string type array key value in Javascript

Question

I have to create array in which key (Index) will be strId (typeof strId is "string") when I am doing so I am getting undefined value in list Below is code.

var myRoomIdList = [];
var strId = "43457";

myRoomIdList[strId] = strId;

console.log(myRoomIdList);
console.log(myRoomIdList.length);

console.log(myRoomIdList);
Output: Undefined, undefiend, ......43457 times

console.log(myRoomIdList.length);
Output: 43457

Please can anyone figure out why It's behaving in this manner. Any help will be appreciated.

You should use an object for this. Use var myRoomIdList = {}; — Jerodev
– Jerodev, Commented Jun 12, 2014 at 13:12

hsz · Accepted Answer · 2014-06-12 13:11:31Z

3

[] array is dedicated for the numeric index. You should use {} instead:

var myRoomIdList = {};

answered Jun 12, 2014 at 13:11

hsz

153k63 gold badges268 silver badges320 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

daZza · Accepted Answer · 2014-06-12 13:13:01Z

0

Arrays have numerical identifiers, use a map instead.

var map = {};

map["ID1"] = "xxx";
map["ID2"] = "yyy";
...

answered Jun 12, 2014 at 13:13

daZza

1,6872 gold badges29 silver badges52 bronze badges

Collectives™ on Stack Overflow

Set string type array key value in Javascript

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related