Prelude

The following items are available globally in every Do program without any import statement.

The dolang executable layers its shell prelude on top of this core prelude. Embedded runtimes may provide a different additional prelude.

std

Name	Description
Array	Array type
array	Variadic array factory
Bin	Bin type
BinBuf	Mutable byte buffer
Bool	Bool type
bool	Truthiness coercion
class	Inherited class member decorator
dbg	Debug representation
Dict	Dict type
dict	Variadic dictionary factory
fields	Proxy for a value's public fields
final	Decorator forbidding subclasses
Float	Float type
float	Numeric coercion and parsing
Func	Func type
getter	Class field getter decorator
Int	Int type
int	Integer coercion and parsing
Iter	Iterator type
Iterable	Iterable value type
mixable	Decorator allowing combination with unrelated classes
Range	Range type
Record	Record type
record	Variadic record factory
Set	Set type
setter	Class field setter decorator
Sink	Sink type
Sinkable	Type of values that provide sinks
static	Uninherited class member decorator
Str	Str type
str	Textual representation
StrBuf	Mutable string buffer
Struct	Struct type
struct	Variadic struct factory
Sym	Sym type
sym	Symbol interning
Tuple	Tuple type
tuple	Variadic tuple factory
Type	Type type
type	Type query and test function
Value	Supertype of all values

Checker-only names from std

These names are available in annotations without an import. They do not bind runtime values, including BaseArray and BaseDict, which are runtime classes. Use a qualified name or an explicit runtime import to use those classes as values.

Names	Purpose
Never, Union	Empty type and unions, including expanded schemas
Seq, AssignSeq, MutSeq	Sequences and their mutation capabilities
Map, AssignMap, MutMap	Dictionary-like reads, assignment, and removal
Index, Assign, Spread, Unpack	Indexing, assignment, spreading, and destructuring
BaseIterable, BaseIter, BaseSinkable, BaseSink	Minimal iteration and sink protocols
UnpackIter, UnpackIterable	Iteration with read-only unpacking
BaseArray, BaseDict	Native container read-only interfaces

strand

The module itself is imported, along with these functions:

Name	Description
fork	Executes blocks concurrently
pipeline	Connects concurrent pipeline stages
stream	Creates a background stream strand
put	Writes to the strand-local output
spawn	Creates a background strand