Access object value javascript

Question

I logged the following:

console.log(io.nsps['/'].adapter.rooms[socket.room]);

and it returned the following:

Room { sockets: { '/#O6L2als5FU-VfHSoAAAA': true }, length: 1 }

How might I edit console.log so that it returns the length value? I tried .length, .sockets.length, I also added [1] to the end. These were all unsuccessful.

user5619350 · Accepted Answer · 2016-09-09 04:07:21Z

2

Since .length is reserved, it returned "Cannot read property 'length' of undefined". Using ["length"] fixed the issue.

answered Sep 9, 2016 at 4:07

user5619350

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14 Comments

zerkms Over a year ago

"Since .length is reserved" --- WAT

user5619350 Over a year ago

I agree David, but it's not mine to change. And to zerkms, I hope that I did not misuse the term 'reserved'.

zerkms Over a year ago

@manbearpig1 uhm, there is nothing special about .length. You can freely assign a property with that name to your object. "Cannot read property 'length' of undefined" error message is about WHERE you read from not WHAT you read.

user5619350 Over a year ago

length is the key which has a value of 1 in this case, while .length is a method that evaluates the length of something.

zerkms Over a year ago

.length and ['length'] are guaranteed by the standard to be evaluated in the same way. If you're using a JS engine that complies with the standard - there is no way to see any difference between how those are interpreted.

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tommybananas · Accepted Answer · 2016-09-09 04:00:33Z

1

console.log(io.nsps['/'].adapter.rooms[socket.room].length); should work

answered Sep 9, 2016 at 4:00

tommybananas

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