Undefined class final
Sentinel used to distinguish between a missing value and an explicit null.
The encoder/merger treats Undefined as “omit this key entirely”, whereas
null is typically serialized as an empty value (e.g. a=) unless strict
null handling is enabled. This mirrors the behaviour of other ports of qs.
The type is immutable and intentionally trivial. Equality is structural via
Equatable; all instances of Undefined compare equal, so you can freely
create them with const Undefined().
- Mixed-in types
Constructors
- Undefined.new()
-
Creates a new sentinel instance. All instances are equal.
const
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
-
props
→ List<
Object> -
No distinguishing fields — all Undefined instances are equal.
no setteroverride
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- stringify → bool?
-
If set to
true, the toString method will be overridden to output this instance's props.no setterinherited
Methods
-
copyWith(
) → Undefined - No-op copy that returns another equal sentinel. Kept for API symmetry.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited