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 f

Answer 1

Hash map will be a perfect tool:

var arrays = {
  top: [],
  left: [],
  right: [],
  bottom: []
};

function addToArray(name, index, value) {
  arrays[name][index] = value;
}

addToArray('top', 5, 100);

I took the liberty to give more explicit names.

I suggest also two good practices:

• do not use eval. Eval is not meant for this kind of dynamic evaluation. In your case, it's a performance killer

• do not polute the global namespace. In browser environnement, avoid adding stuff to window (which is global).