はてなブックマーク

やりたい事 二つの入力を比較して、マッチしていない部分を強調して表示させたい。 例えば、「AbcDefGh」と「abeffh」という入力があったら、以下のようなイメージで表示させたい。 これでパッと見で差分がわかるようにする！ diff-lcs で文字列を比較する どうやって差分とろうかなあと考えていたら、diff-lcs で簡単に出来た。 Diff::LCS.sdiff('AbcDefGh', 'abefffh') => [["!", [0, "A"], [0, "a"]], ["=", [1, "b"], [1, "b"]], ["-", [2, "c"], [2, nil]], ["-", [3, "D"], [2, nil]], ["=", [4, "e"], [2, "e"]], ["=", [5, "f"], [3, "f"]], ["!", [6, "G"], [4, "f"

Rails 5 の目玉(？)機能である ActionCable を触ってみようと、README を読んで単純なチャットアプリを作ってみました。簡単な説明とサンプルコードを載せます。 ActionCable 概要 WebSocket と REST である Rails を統合させた、Rails にリアルタイム機能を追加するためのものです。クライアントサイド (JS) と サーバーサイド (Ruby) の両方のフレームワークを提供します。 WebSocket? WebSocket は RFC6455 で定義されている、Web でリアルタイム通信を行うための通信技術です。最初にハンドシェイクと呼ばれる HTTP 通信を行うのですが、それ以降はサーバーとクライントを接続しっぱなしにして、ステートフルに TCP 通信を行います。WebSocket の利点は主に 2 つです。 サーバープッシュが可能（リ

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class Person include ActiveModel::AttributeMethods attr_accessor :name, :age, :address attribute_method_prefix 'clear_' define_attribute_methods :name, :age, :address def initialize(name:, age:, address:) @name = name @age = age @address = address end private def clear_attribute(attr) send("#{attr}=", nil) end end person = Person.new person.name = 'Bob' person.name #=> "Bob" person.clear_name pers

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Rails のコードを読んでいると、module ClassMethods って多く書かれている事が分かると思いますが、こいつが何をやっているのかを話していきます。 module ClassMethods を説明する前に、まず、以下のような Module と Class を定義します。 module ModuleA def self.class_method_a 'class_method_a' end def instance_method_a 'instance_method_a' end end class ClassA include ModuleA end

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