Functions and Operators

After the quite challenging material of the last lessons, we wrap up this section with a few more lightweight lessons on additional syntax, starting with operators.

Functions vs. operators

So far in this course, we have differentiated between functions (like div or mod) and operators (like + or *). The apparent difference between them is that:

• Functions are used in prefix notation – the function name precedes the arguments (e.g., mod 5 2).
• Operators are used in infix notation – the operator is between its arguments (e.g., 3 + 5).

Because of the infix notation, operators can only take two arguments, while functions can take any number. ...