Ruby – 変数と定数

変数の先頭はアルファベット小文字。任意のオブジェクト（の参照番地）を代入可能。

number = 1
string = "壱"
puts number
puts string
number = 2
string = "弐"
puts number
puts string
number = string
puts number

# 1
# 壱
2# 
# 弐
# 弐

number = 1

string = "壱"

puts number

puts string

number = 2

string = "弐"

puts number

puts string

number = string

puts number

# 1

# 壱

# 弐

定数は先頭がアルファベット大文字。定数に値を代入しようとするとwarning。

Const = 1
Const = 2
CONST = "壱"
CONST = "弐"
puts Const, CONST

# C:/Users/.../variable_and_constatnst.rb:2: warning: already initialized constant Const
# C:/Users/.../variable_and_constatnst.rb:1: warning: previous definition of Const was here
# C:/Users/.../variable_and_constatnst.rb:4: warning: already initialized constant CONST
# C:/Users/.../variable_and_constatnst.rb:3: warning: previous definition of CONST was here
# 2
# 弐

Const = 1

Const = 2

CONST = "壱"

CONST = "弐"

puts Const, CONST

# C:/Users/.../variable_and_constatnst.rb:2: warning: already initialized constant Const

# C:/Users/.../variable_and_constatnst.rb:1: warning: previous definition of Const was here

# C:/Users/.../variable_and_constatnst.rb:4: warning: already initialized constant CONST

# C:/Users/.../variable_and_constatnst.rb:3: warning: previous definition of CONST was here

# 2

# 弐

TauStation

Ruby – 変数と定数

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