5 Statements

8.12

syntax
(block stmt ...)

Evaluates each stmt in order, returning the value of the last statement.

syntax
(var [id expr] ...)

Updates the value of the variable bound to id with the result of evaluating expr.

syntax
(empty-statement)

Does nothing.

syntax
(if test true)
(if test true false)

Evaluates test, then executes true if the result of applying to-boolean to the resulting value is #t. Otherwise, false is executed if supplied.

syntax
(for maybe-init maybe-test maybe-update body ...)

maybe-init =
| #:init init

maybe-test =
| #:test test

maybe-update =
| #:update update

syntax
(while test body ...)

Repeatedly executes body so long as the result of (to-boolean test) is #t beforehand.

Equivalent to

(for #:test test body ...)

syntax
(break)
(break label)

Aborts the enclosing loop, or the loop with label label. This form is illegal outside of a for or while loop.

syntax
(continue)
(continue label)

Jumps to the next iteration of the enclosing loop, or the loop with label label. This form is illegal outside of a for or while loop.

syntax
(with expr form ...)

syntax
(label id stmt)

syntax
(throw expr)

syntax
(try form ... maybe-catch maybe-finally)

maybe-catch =
| #:catch catch-id catch-form ...

maybe-finally =
| #:finally finally-form ...