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to_iメソッドの使い方

Last updated at Posted at 2021-08-27

##to_iとは?
数字の文字列を数値オブジェクトに変換するメソッドです。
また、小数を整数に変換することもできます。

以下、サンプルコードになります。

使用例
オブジェクト.to_i

num = "1"
p num
=> "1" (文字列)

num.to_i
=> 1 (整数)

puts 100 + "100"  #数値オブジェクト + 文字オブジェクトは計算できない
puts 100 + "100".to_i #to_iを使って文字オブジェクト ⇒ 数値オブジェクトに変える
⇒ 200

###小数を整数に変えることもできる

# 小数として定義
num = 1.0
num.class
=> Float

#整数に変換
num = num.to_i
num.class
=> Integer

####参考記事
https://pikawaka.com/ruby/to_i

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