MultiKey class

A composite grouping key built from several selector values.

A raw List cannot be a Map key because lists use identity equality — two lists with equal contents are different keys. MultiKey gives the tuple value equality (element-wise) and a matching hash, so grouping by (country, year) collapses every row with the same pair into one bucket.

Annotations

• @immutable

Constructors

MultiKey(List<Object?> values)

Wraps the ordered selector values that make up this composite key. Audited: 2026-06-12 11:26 EDT

const

Properties

hashCode → int

The hash code for this object.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

values → List<Object?>

The selector values in selector order (e.g. [country, year]).

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override