Ord型クラス - mrsekut-p

Ord型クラス

全順序を付けられる型

Eq型クラスを継承する

methods

(>), (<), (>=), (<=)

code:hs

class Eq a => Ord a where

compare :: a -> a -> Ordering

(<), (<=), (>), (>=) :: a -> a -> Bool

max, min :: a -> a -> a

fp-ts ref

code:ts

import { Eq } from 'fp-ts/lib/Eq'

type Ordering = -1 | 0 | 1

interface Ord<A> extends Eq<A> {

readonly compare: (first: A, second: A) => Ordering

}

Ordering

first > secondなら-1

first == secondなら0

first < secondなら1