std-list.md

std.list

Source: std/list/list.goop
Import: import goop "std.list" or import goop . "std.list"

Combinators live in the prelude as List.filter / List.map / List.fold / List.find (Go generics — goop build works). This module re-exports Filter / Map / Fold as thin aliases of those helpers.

Exports

Name	Type	Description
Filter	('a -> bool) -> 'a list -> 'a list	Keep elements where f is true
Map	('a -> 'b) -> 'a list -> 'b list	Map a function over every element
Fold	('acc -> 'a -> 'acc) -> 'acc -> 'a list -> 'acc	Left fold

Prefer prelude spelling in new code:

let evens = List.filter (fun n -> n mod 2 = 0) xs
let evens2 = xs.filter (fun n -> n mod 2 = 0)

List construction ([], ::) is builtin. Keep this module thin.