Acessing javascript multidimensional array with linear values

How could I set a variable that I can read by using eval('productOptionTree' + '[0][1][0]')?

(the '[0][1][0]' part comes from another variable)

UPDATE it's an ugly question, but I couldn't find another way to do it. the onl开发者_运维技巧y answer I could find is:

newVal = 4;

dim = '[0][1][0]';

eval('productOptionTree'+dim+' = ' +newVal);

You don't need eval to read the item. Just do:

var x = productOptionTree[product[0]][product[1]][product[2]];

As you are free of eval, you can now easily use the same way to set the item:

productOptionTree[product[0]][product[1]][product[2]] = 42;