Python,Ruby,PHP,Java,JavaScript,Perlのコマンドライン引数の比較 | プログラミング言語比較JavaRubyPythonPHPJavaScript

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Perlはクラスの仕組みがわかりにくいというご意見をいただいたので、Perlコアだけで、クラスを作成する方法を簡単に解説したい。 理解している方からすれば、そうは感じないかもしれないですが、書くのはeasyかもしれないですけど、どう考えてもsimpleではないですよね〜… ・暗黙の了解としてのいろいろな記法、仕組み ・Classの仕組み ・調べにくい記号 ・IDEの恩恵を受けれない 他のLLから乗り換えるとこの辺りでしょうか— serinuntius (@_serinuntius) September 18, 2018 Perlのクラス構文はパラダイムが違う Perlには、クラス構文がないのよ。だから、javaとかrubyから始めて、Perlを使うと、Perlには、クラス構文がないから、簡単に書けないと感じるのね。 Perlのパラダイムでは、こうなります。 オブジェクトとは、データに名前空

例外の実装について調べたり考えたりしていた。 一番多い内部実装はなんだと思いますか? 「うーん、ちょっと内部まではわからないなぁ」「何らかの方法でジャンプしてたりするのかな」 僕が調べた範囲では、setjmp、longjmpを使っている実装が多かった。 Java, C++, rubyなど。 setjmp、longjmpの魔 setjmp、longjmpは気をつけてつかわないといけない関数だ。 setjmpは、関数を超えて、ジャンプできる。 関数から、他の関数へピヨーンとひっととび。 setjmp, longjmp とは setjmp, lognjmp は古典的に標準ライブラリ関数として実装されているＣライブラリ関数である。setjmp, longjmp はペアになって、関数の外にジャンプする機構を実現する。よろしいか、goto 文がたかが関数内部での制御の移動を実現するのに引き換え、この