lens-5.0.1: Lenses, Folds and Traversals
Copyright (C) 2014-2016 Edward Kmett and Eric Mertens
License BSD-style (see the file LICENSE)
Maintainer Edward Kmett <ekmett@gmail.com>
Stability provisional
Portability non-portable
Safe Haskell Safe-Inferred
Language Haskell2010

Control.Lens.Internal.List

Description

This module provides utility functions on lists used by the library implementation.

Synopsis

Documentation

ordinalNub Source #

Arguments

:: Int

strict upper bound

-> [ Int ]

ordinals

-> [ Int ]

unique, in-bound ordinals, in order seen

Return the the subset of given ordinals within a given bound and in order of the first occurrence seen.

Bound: 0 <= x < l

>>> ordinalNub 3 [-1,2,1,4,2,3]
[2,1]