型の紹介 型クラス 文字列、出力
入門Haskellプログラミング (Will Kurt(著)、株式会社クイープ(監修、翻訳)、翔泳社)のUNIT2(型の紹介)、LESSON 13(型クラス)、13.1(型をさらに調べる)、クイックチェック 13-1の解答を求めてみる。
入出力結果(Terminal, Zsh)
% stack ghci
Using main module: 1. Package `lesson' component lesson:exe:lesson-exe with main-is file: /Users/…/lesson/app/Main.hs
The following GHC options are incompatible with GHCi and have not been passed to it: -threaded
Configuring GHCi with the following packages: lesson
* * * * * * * *
Warning: Multiple files use the same module name:
* Paths_lesson found at the following paths
* /Users/…/lesson/.stack-work/dist/x86_64-osx/Cabal-3.4.1.0/build/autogen/Paths_lesson.hs (lesson:lib)
* /Users/…/lesson/.stack-work/dist/x86_64-osx/Cabal-3.4.1.0/build/lesson-exe/autogen/Paths_lesson.hs (lesson:exe:lesson-exe)
* * * * * * * *
GHCi, version 9.0.2: https://www.haskell.org/ghc/ :? for help
macro 'doc' overwrites builtin command. Use ':def!' to overwrite.
(0.00 secs, 0 bytes)
(0.00 secs, 0 bytes)
Loaded GHCi configuration from /Users/…/.ghc/ghci.conf
[1 of 3] Compiling Lib ( /Users/…/lesson/src/Lib.hs, interpreted )
[2 of 3] Compiling Main ( /Users/…/lesson/app/Main.hs, interpreted )
[3 of 3] Compiling Paths_lesson ( /Users/…/lesson/.stack-work/dist/x86_64-osx/Cabal-3.4.1.0/build/autogen/Paths_lesson.hs, interpreted )
Ok, three modules loaded.
Loaded GHCi configuration from /private/var/folders/wj/52wjq8dn0fj1qltsnx3xxpnh0000gn/T/haskell-stack-ghci/7841fae3/ghci-script
*Main Lib Paths_lesson
λ> aList = ["cat", "dog", "mouse"]
aList :: [String]
(0.00 secs, 498,440 bytes)
*Main Lib Paths_lesson
λ> :type aList
aList :: [String]
*Main Lib Paths_lesson
λ> :t aList
aList :: [String]
*Main Lib Paths_lesson
λ> :quit
Leaving GHCi.
%