JavaScript Two-Dimensional array is undefined

Question

I was trying to resolve my error with other answers but just fail. I have this simple example of what I think is two-dimensional array but it keeps returning me undefined error.

var city = 'London',
    country = 'England';

var locate = [];
locate['London']['England'] = ['Jhon','Mike'];

for (i = 0; i < locate[city][country].length; i++) {  
  console.log(locate[city][country][i]);
}

jsbin http://jsbin.com/pixeluhojawa/1/

what am I doing wrong in this example, I would appreciate your help.

A 2x2 matrix / array in javascript is an Array inside an Array. Can you provide in matrix form what you are trying to put into the arrays? Are you try {[London, England], [John, Mike]}? — sbjumani
– sbjumani, Commented Aug 27, 2014 at 8:31

Cerbrus · Accepted Answer · 2014-08-27 08:28:38Z

2

Before you can assign a value to locate['London']['England'], you'll have to make sure that locate['London'] is an object:

var locate = {};
locate['London'] = {};
locate['London']['England'] = ['Jhon','Mike'];

Notice how I used an object literal ({}) instead of an array literal ([]). Arrays don't support string keys like this. You'll need to use objects instead.

You can also declare it like this::

var locate = {
    London:{
        England:["Jhon","Mike"]
    }
}

answered Aug 27, 2014 at 8:28

Cerbrus

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4 Comments

Derek 朕會功夫 Over a year ago

Also it should be locate = {}. This isn't an array ;)

Cerbrus Over a year ago

@Derek朕會功夫: I missed the obvious, edited the answer :P

devjs11 Over a year ago

I like more your other way of declaration but it says its missing semicolon. Is this correct structure var locate = { London:{ England:["Jhon","Mike"] } }

Cerbrus Over a year ago

I'm glad to be of help, @devjs11 :-). locate = {London:{England:"Jhon","Mike"]}} should work just fine.

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