# Generally functions have a fixed number of un-named arguments.
JustOne ← (1)   # Nonadic.  Returns a 1.
PlusOne ← +1    # Monadic. Adds 1 to its argument.
MeanOne ← ÷ 2 + # Dyadic. Mean of its two arguments.
# Triadic = ++, Tetradic = +++, Pentadic = ++++,  etc

# Values are passed and returned on the stack.
JustOne   # -> 1 on the stack
PlusOne   # consumes the 1, adds 1, leaves the 2 on the stack.
MeanOne 3 # MeanOne sees 3 and 2 on the stack and returns 2.5

# Some functions can take an optional suffix.
⁅1.23456  # ->1
⁅₂1.23456 # -> 1.23

# Some operators can take function packs, leading to more flexibility.
# E.g. '⊃ fork' applies all the functions to its arguments.
⊃(¯|+|-|÷|×|$"_ _ _"1) 2 3 # -> ¯2 5 1 1.5 6 "1 2 3"