3 ms·

Function parameters are variables even in pure FP. If your definition of variable requires assignment, then even mathematics doesn't have variables.

• Aloisius 13y ago
  Sure it does. The summation sigma has a variable right under it. Though they like to call it the index of summation, it is a variable with assignment.
  • nightski 13y ago
    Pretty sure summation definition is recursive. So no assignment/mutation is necessary.