Statements

Simple statement

An expression followed with an optional semicolon.

Compound statement

A sequence of statements between braces.

JSON statement

An expression optionally followed with a comma.

Iteration statements

for loop

for ( expression ; expression ; expression ) statement

Consists of three expressions between parenthesis spliced with semicolons followed with a statement. Executes the first expression and then while the value of the second expression is true executes the third expression and the statement.

for ( left expression in expression ) statement

Iterates over iterable object. Invokes itarator method on the result of second expression, result of invoking iterator method should satisfy iterator requirements. First expression should be in form identifier, expression.identifier or let identifier. Equivalent of:

let leftExpression
let it <- expression.iterator()
while (!(leftExpression <- it.next()) is Iterator.end)
    statement

while loop

while ( expression ) statement

Consists of condition between parenthesis followed with a statement. While the condition is true executes the statement.

Control flow

if … else statement

if ( expression ) statement

if ( expression ) statement else statement

If the condition is true, then executes the statement.

try … catch statement

try statement catch statement

Executes the first statement. If an exception is thrown, stops the execution of the first statement, declares variable exception, and executes the second statement.

return statement

• return expression

Ends execution of functions. The value of the current function call is a.

throw statement

• throw expression

Stops execution of current context. Throws a.

break

Exits loop. Usage of break outside the loop results in undefined behavior.