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

Put all your arrays into an object:

var myArrays = { 
    top : arrayTop,
    left: arrayLeft,
    right: arrayRight,
    bottom: arrayBottom
}

And the to get an array you can just:

myArrays["top"][5] = 100;

Or you can skip defining the arrays as global variables and just do something like:

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

Which initializes 4 empty arrays which you can populate:

myArrays["top"][0] = 100;

or

myArrays.top[0] = 100;

However, if top, left, right and bottom all are related (refering to the same object), it might make more sense to create an object with those properties and create a single array of those objects:

function MyObj(top, left, right, bottom) {
   this.top = top;
   this.left = left;
   this.right = right;
   this.bottom = bottom;
}

var myArray = [];

myArray.push(new MyObj(1,2,3,4));
console.log(myArray[0]);

myArray[0].left = 7;
console.log(myArray[0]);

http://jsfiddle.net/UNuF8/