Targets · Dart · Reserved words

Reserved words

Dart keeps a set of words for its own syntax, so a program cannot use them as names. When a Program name collides with one, the renderer appends a single underscore — class becomes class_ — so the program keeps the name it chose and the output still compiles. Because _ is illegal in a Program identifier, the escape can never collide with a name a program actually chose.

How a Program becomes Dart, in parts. Start with the introduction, then follow each part into the rendered output and the runtime it links against.

Introduction — what the Dart target is, and how to read the rest of this section.
Capabilities — which high-level features are possible, built in or through a library.
Example — a full program using every keyword, and the Dart it renders to.
Naming considerations — how Program's dotted names are carried into Dart.
Entry point — starting a program and mounting it as a Flutter app.
Drivers — the native drivers that provide the interface, animation and network.
Runtime — the Reactive and Context machinery the rendered code links against.
Native modules — the hand-written Dart behind NATIVE functions.
Keywords — how each of Program's keywords renders to Dart.
Project setup — the files and commands to build and run the rendered program.
Reserved words — the words Dart keeps for itself, and how a colliding name is escaped.

The full list

Every word Dart reserves, with the identifier a colliding Program name is escaped to. The rule is uniform — append a single _:

Reserved word	Rendered identifier
`abstract`	`abstract_`
`as`	`as_`
`assert`	`assert_`
`async`	`async_`
`await`	`await_`
`break`	`break_`
`case`	`case_`
`catch`	`catch_`
`class`	`class_`
`const`	`const_`
`continue`	`continue_`
`covariant`	`covariant_`
`default`	`default_`
`deferred`	`deferred_`
`do`	`do_`
`dynamic`	`dynamic_`
`else`	`else_`
`enum`	`enum_`
`export`	`export_`
`extends`	`extends_`
`extension`	`extension_`
`external`	`external_`
`factory`	`factory_`
`false`	`false_`
`final`	`final_`
`finally`	`finally_`
`for`	`for_`
`function`	`function_`
`get`	`get_`
`hide`	`hide_`
`if`	`if_`
`implements`	`implements_`
`import`	`import_`
`in`	`in_`
`interface`	`interface_`
`is`	`is_`
`late`	`late_`
`library`	`library_`
`mixin`	`mixin_`
`new`	`new_`
`null`	`null_`
`on`	`on_`
`operator`	`operator_`
`part`	`part_`
`required`	`required_`
`rethrow`	`rethrow_`
`return`	`return_`
`sealed`	`sealed_`
`set`	`set_`
`show`	`show_`
`static`	`static_`
`super`	`super_`
`switch`	`switch_`
`sync`	`sync_`
`this`	`this_`
`throw`	`throw_`
`true`	`true_`
`try`	`try_`
`typedef`	`typedef_`
`var`	`var_`
`void`	`void_`
`while`	`while_`
`with`	`with_`
`yield`	`yield_`

Reserved words

Contents

The full list