jQuery HashMap Implementation: Missing : after Property ID Error

Question

I'm trying to dynamically populate a HashMap in jQuery, and am following this example: https://stackoverflow.com/a/4247012/1005607 Orig Question: How to create a simple map using JavaScript/JQuery

I need to add a hash entry where the key comes from an array item, and the value is a variable. But I'm getting an error. What's wrong? This should be equivalent to populating "item2" -> 2 in the HashMap. I would be able to get 2 by invoking laneMap.get("item2").

var laneMap = {};

var eventIDs = [];
eventIDs.push('item1');
eventIDs.push('item2');

var currlane = 2;

laneMap.push({eventIDs[1] : currlane });

Side note, what you are calling a HashMap is just an Object in javascript. — Taplar
– Taplar, Commented Nov 10, 2017 at 22:05

Sanchit Patiyal · Accepted Answer · 2017-11-10 22:13:07Z

2

You can't add key/value pair using push. There are two ways of doing it Using dot notation:

obj.key3 = "value3";

Using square bracket notation:

obj["key3"] = "value3";

var laneMap = {};

var eventIDs = [];
eventIDs.push('item1');
eventIDs.push('item2');
   
var currlane = 2;
laneMap.key = currlane-1;
laneMap[eventIDs[1]] = currlane ;
console.log(laneMap);

P.S.- You can't use [] in dot notation

edited Nov 10, 2017 at 22:13

answered Nov 10, 2017 at 22:03

Sanchit Patiyal

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James · Accepted Answer · 2017-11-10 22:02:25Z

2

You can only use .push with an array. Here's how to assign a dynamic object property:

laneMap[eventIDs[1]] = currlane;

answered Nov 10, 2017 at 22:02

James

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