dynamic array names javascript

Question

I have a few arrays with like names.

ArrayTop[]  
ArrayLeft[]   
ArrayRight[]  
ArrayWidth[]

I am trying to set the name dynamically in a function and then set value.

I have tried many ways of dynamically picking the right array but have not come up with a solution.

function setarray(a,b,c){
    eval(Array+a+[b])=c
}

setarray('Top',5,100)

In this example i am trying to set.

ArrayTop[5]=100

Answer 1

If you are doing this in the browser, one possible solution would be to do:

function setArray(a, b, c){
    window['Array' + a][b] = c;
}

setArray('Top', 5, 100);

I would recommend that all your array's be contained in some object and not pollute the global namespace. So it would be more like:

var arrays = {
    ArrayTop: [],
    ArrayNorth: []
};

function setArray(a, b, c){
    arrays['Array' + a][b] = c;
}

setArray('Top', 5, 100);

I would not recommend using eval. Eval is not meant for this kind of dynamic evaluation and it is a huge performance hit.