Javascript Variable Issue

why does this http://jsfiddle.net/BkGxq/1/ return '$undefined' ? if i dont do level_prices['f'.i] = i; and do level_prices[i] = i; it works, (i also change it in the html to v

Solution 1:

The dot is not the string concatenation operator, but the property accessor. You want

level_prices['f'+i] = i;

'f'.i gets the literal "i" property of the string object, which is undefined.

Solution 2:

In JavaScript, you concatenate strings with + instead of .

Try:

level_prices['f'+i] = i;

Edit: updated your JSFiddle: http://jsfiddle.net/BkGxq/2/