How to access a hash inside of an array by key

Question

I'm looking at this code I am not able to get the value of 'start' in the hash.

 w[l] = w[l] || [];
    w[l].push({
        'gtm.start':
            new Date().getTime(),
        event: 'gtm.js'
    });

I thought I could do:

w[l].start

or

w[l]['start']

But I get undefined errors.

w is passed in as a parameter, and it is a window object.

the name of the properly is gtm.start

Ramanlfc
– Ramanlfc

2016-03-31 14:41:34 +00:00
Commented Mar 31, 2016 at 14:41 — Ramanlfc
– Ramanlfc, Commented Mar 31, 2016 at 14:41
also w[l] is an array

Hacketo
– Hacketo

2016-03-31 14:42:22 +00:00
Commented Mar 31, 2016 at 14:42 — Hacketo
– Hacketo, Commented Mar 31, 2016 at 14:42
what about w[l].gtm.start

cl3m
– cl3m

2016-03-31 14:42:44 +00:00
Commented Mar 31, 2016 at 14:42 — cl3m
– cl3m, Commented Mar 31, 2016 at 14:42

Hacketo · Accepted Answer · 2016-03-31 14:45:36Z

1

w[l] is an array w[l] = w[l] || [];

Then you push an object to that array w[l].push({ ...

So you can access that object property with w[l][0]['gtm.start'] (assuming that the array is empty when you pushed the object)

answered Mar 31, 2016 at 14:45

Hacketo

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omarjmh · Accepted Answer · 2016-03-31 14:49:08Z

1

Working JsBin: https://jsbin.com/zilado/1/edit?js,console

So lets say you start with an empty array at w[1], w itself is also an array.

You then push an Object to that array so w[1] is an array with an Object in it, that object has what your looking for, and you can access it like so:

var w = [];
w[1] = [];


w[1].push({'gtm.start': new Date().getTime()});

console.log(w[1][0]['gtm.start'])

edited Mar 31, 2016 at 14:49

answered Mar 31, 2016 at 14:43

omarjmh

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