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オブジェクトの同一性

Ruby,オブジェクト

Last updated at 2016-12-03Posted at 2016-12-03

メモ

すべてのオブジェクトは「ID」と「値」を持つ。

test.rb

str1 = "foo"
str2 = str1
str3 = "foo"
#equal?はIDか同じかどうか判定する
p str1.equal?(str2)
# =>true
p str1.equal?(str3)
# =>false

p str1.object_id
# =>70338021665000
p str2.object_id
# =>70338021665000
p str3.object_id
# =>70338021664980

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