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block
var
empty-statement
if
for
while
break
continue
with
label
throw
try
7.1

5 Statements

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.

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 ...