gistfile1.coffee

class DGArray
    constructor: (Type, @lengths...) ->
        if @lengths.length is 0
            throw new RangeError("Not enough lengths.")
        
        length = 1
        for l in @lengths
            length *= l
            
        @data = new Type(length)
        
    index = (indices, lengths) ->
        if indices.length < lengths.length
            throw new RangeError("Not enough indices.")
                    
        ret = 0
        for index, i in indices
            for q in lengths[i + 1...]
                index *= q
            
            ret += index
            
        return ret
        
    get: (indices...) ->
        return @data[index(indices, @lengths)]
        
    set: (indices..., val) ->
        @data[index(indices, @lengths)] = val
        
arr = new DGArray(Int32Array, 3, 4, 5)
arr.set(2, 3, 4, 5)
console.log arr.get(2, 3, 4) # 5