Keywords & Syntax

Affogato adds keywords and syntax sugar that lower to standard Java 21. Each entry shows the Affogato form and its Java equivalent.

Variables

keyword

let

Immutable binding — equivalent to Java final.

keyword

var

Mutable binding for locals and fields.

Methods

keyword

func

Shorthand for void return type on methods.

keyword

init

Explicit constructor keyword — replaces the Java class-name constructor.

keyword

override

Marks a method that overrides a superclass or interface member.

syntax

Named arguments

Call-site argument labels: name = value.

syntax

Optional new

Constructor calls work with or without the new keyword.

syntax

Trailing closures

Block after a call binds to the last parameter.

Control Flow

keyword

guard

Swift-style early exit when a condition is false.

keyword

in

For-in iteration over arrays and Iterable collections.

Operators

keyword

is

Type test — equivalent to Java instanceof.

keyword

as

Cast expression — equivalent to Java (Type) expr.

keyword

not

Keyword-style logical negation — equivalent to prefix !.

Types

syntax

: inheritance

Single colon replaces extends and implements.

syntax

Type? and Type!

Nullable and non-null reference type suffixes.

syntax

name: Type

Type-after-name declaration syntax for parameters, locals, and fields.

Collections

syntax

[T] list shorthand

Square-bracket syntax for java.util.List.

Literals

syntax

String interpolation

$name and ${expr} inside string literals.

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