EqualityBy< E, F> class
Equality of objects based on derived values.
For example, given the class:
abstract class Employee {
int get employmentId;
}
The following Equality considers employees with the same IDs to be equal:
new EqualityBy((Employee e) => e.employmentId);
It's also possible to pass an additional equality instance that should be used to compare the value itself.
- Implemented types
-
- Equality<
E>
- Equality<
Constructors
-
EqualityBy(F getKey(E object), [ Equality<
F> inner = const DefaultEquality() ])
Properties
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
equals(
E e1, E e2) → bool -
Compare two elements for being equal. [...]
override
-
hash(
E e) → int -
Get a hashcode of an element. [...]
override
-
isValidKey(
Object o) → bool -
Test whether an object is a valid argument to equals and hash. [...]
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
-
toString(
) → String -
Returns a string representation of this object.
inherited
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
inherited