Recursion

Aquarius has only one loop control expression, for expression.

for expression

expression2 will be calling when expression1 evaluates to true, or it will jump to next stage of codes.

(for {expression1}:
  {expression2}..
)

Optinally, for expression contains an else sub expression which will be calling while expression1 evalutes to false.

(for {expression1}:
  {expression2}..
else
  {expression3}..
)

In scope of the for expression, we can use two specific directives continue and break to do special stop. Their behavior are similar to that in other languages.

• break - exit from current loop immediately.
• continue - move from current cycle into next one.

(let i = 1)
(for (i < 10):
  (if (i even?): break)
  (i = (i + 1))
else
  (puts: i) #i == 2#
)