Range

type `Range`

Implements Enumerable, Foldable.

Range — a range computes everything from its two bounds; items materializes the elements into a real list when one is needed.

`reduce`

reduce(acc, f)

Shared primitive for Enumerable and Foldable. Range stays structurally minimal; inherited operations reduce over its materialized items in ascending range order.

`sum`

Numeric range aggregates are expressed in terms of the Enumerable primitive rather than relying on the walker's historical List fallback.

`contains?`

contains?(value)

Membership is a Range method, not a fallback into the bare String/List native dispatcher.

`items`

The range's elements as a list.

Examples

(1..3).items      # => [1, 2, 3]
('a'..'c').items  # => ['a', 'b', 'c']

The list operations, over the materialized items. A range is an ordered collection, so (1..5).first and (1..5).length are questions it can answer — and on the BEAM backend, where a range IS its item list, they already worked. Only the walker rejected them ("Undefined method: first for Range"), so every one of these was a backend divergence rather than a deliberate restriction.