I'm not sure why you're including BASIC in with the dynamic languages -- in its classic microcomputer form, it's pretty well limited to int or float, and string

I'm not sure why you're including BASIC in with the dynamic languages -- in its classic microcomputer form, it's pretty well limited to int or float, and string, and arrays of those things. When you make a variable, you always define it's type (A is a double, but A$ is a string). Some versions are a little bit richer in that you can have both ints AND doubles (woot, woot!).