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ruby:メモ

Ruby

Last updated at 2015-04-26Posted at 2015-04-26

ruby:メモ

コーディング規約

覚えておきたいメソッド

"hello, world".upcase
=> "HELLO, WORLD"

"hello, world".reverse
=> "dlrow, olleh"

"hello, world".methods
=> [:<=>, :==, :===, :eql?, :hash, :casecmp, :+, :*....

object_id(=self.object_id)
=> 17084920

1.+(1)(=1 + 1)
=> 2

object.singleton_methods
=> [:to_s, :inspect, :context, :conf, :irb_quit,...

hello = "hello, world"
hello.class
=> String

クラスとインスタンス

インスタンス変数の定義

class Book
	def author
		@author
	end
	def title
		@title
	end
	def isbn
		@isbn
	end

	def author=(author)
		@author = author
	end
	def title=(title)
		@title = title
	end
	def isbn=(isbn)
		@isbn = isbn
	end
end

↓等価↓

class Book
	attr_accessor :author, :title, :isbn
end

外部ファイルの読み込み

require_relative 'book'
=> true

インスタンス生成

book = Book.new
=> #<Book:0x007fba434564f3>

値の設定

book.author = "jon smith"
=> "jon smith"

値の取得

book.author
=> "jon smith"

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