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ElixirAdvent Calendar 2022

Day 1

今日のElixirSchoolメモ1「基本」

Last updated at Posted at 2022-10-29

本記事はElixir Schoolの学習メモです。
気になることが増えたら追記します。

ブール演算子

「ブール演算子(and,or,not)」と「ゆるいブール演算子(||,&&,!)があって、前者は最初の引数はtrueかfalseのみ指定できます。

iex(15)> true and 42
42
iex(16)> 42 and true
** (BadBooleanError) expected a boolean on left-side of "and", got: 42

iex(16)> not false
true
iex(17)> not 42
** (ArgumentError) argument error
    :erlang.not(42)

比較

型が同じか互換性がない場合、次のルールに従って比較が行われる
number < atom < reference < function < port < pid < tuple < map < list < bitstring

iex(17)> :hello > 999
true
iex(18)> {:hello, :world} > [1, 2, 3]
false
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