Create a multidimensional array with a variable key

Question

I have an array:

var arr = Array()

I wish to make this a multidimensional array, but I wish to pass in the keys dynamically.

Is there a way to do this?

p.addArrayKey = function(key){

    arr.key.push('something');

}

Answer 1

You have not really explained what you mean by "multidimensional array". Multidimensional means that your elements would need to be accessed via more than one index. Example:

arr[ 3, 4 ] = ...; // tells us that arr is a 2-dimensional array
arr[ 4, 5, 1 ] = ..; //.....3-dimensional array

arr[ key ] = 'something'; // is a one-dimensional array!!

But yes, you can use a key as an index as follows. You cannot use the dot notation because key is a variable. And since you have the index, key , you don't use push but you can assign the value directly:

arr[ key ] = 'something';

So that your method is:

p.addArrayKey = function(key, something){

    arr[ key ] = something;

};

And you can call it like so:

p.addArrayKey ( 'mykey', 'something' );

And the output would be:

[mykey: "something"] 

WORKING JSFIDDLE DEMO

However if something is the key you want to create in the array:

arr.something = 'initial value'; // or
arr[ 'something' ] = 'initial value'; //

Should work just fine.