Ruby 在将多个用户输入保存为变量之前，检查它们是否满足特定条件

有没有办法将这两块代码组合起来，以减少冗余

puts "first number?"
num1 = gets.chomp.to_i
until num1.is_a?(Integer)
  puts "please enter an actual number"
  num1 = Integer(gets.chomp) rescue nil
end

puts "second number?"
num2 = gets.chomp.to_i
until num2.is_a?(Integer)
  puts "please enter an actual number"
  num2 = Integer(gets.chomp) rescue nil
end

---

你可以这样做

def get_int(msg)
  puts msg
  loop do
    n = Integer(gets, exception: false)
    break n if n
    puts "please enter an actual number"
  end
end

first number?
cat
please enter an actual number
72.1
please enter an actual number
16

second number?
&dog
please enter an actual number
10/2
please enter an actual number
-4

获取

num1

值的对话框如下所示

def get_int(msg)
  puts msg
  loop do
    n = Integer(gets, exception: false)
    break n if n
    puts "please enter an actual number"
  end
end

first number?
cat
please enter an actual number
72.1
please enter an actual number
16

second number?
&dog
please enter an actual number
10/2
please enter an actual number
-4

获取

num2

值的对话框如下所示

def get_int(msg)
  puts msg
  loop do
    n = Integer(gets, exception: false)
    break n if n
    puts "please enter an actual number"
  end
end

first number?
cat
please enter an actual number
72.1
please enter an actual number
16

second number?
&dog
please enter an actual number
10/2
please enter an actual number
-4

见和<在Ruby v2.6中，code>Kernel#Integer被赋予了可选参数

exception:false

---

使用

循环

的一个优点是它提供了一定程度的数据封装。与

while

和

until

不同，

loop

获取一个块，从而避免窥视块内定义的局部变量的值。除了

循环

之外，我很少使用任何东西来进行循环

def get_int(msg)
  puts msg
  loop do
    n = Integer(gets, exception: false)
    break n if n
    puts "please enter an actual number"
  end
end

first number?
cat
please enter an actual number
72.1
please enter an actual number
16

second number?
&dog
please enter an actual number
10/2
please enter an actual number
-4

获取

num1

值的对话框如下所示

def get_int(msg)
  puts msg
  loop do
    n = Integer(gets, exception: false)
    break n if n
    puts "please enter an actual number"
  end
end

first number?
cat
please enter an actual number
72.1
please enter an actual number
16

second number?
&dog
please enter an actual number
10/2
please enter an actual number
-4

获取

num2

值的对话框如下所示

def get_int(msg)
  puts msg
  loop do
    n = Integer(gets, exception: false)
    break n if n
    puts "please enter an actual number"
  end
end

first number?
cat
please enter an actual number
72.1
please enter an actual number
16

second number?
&dog
please enter an actual number
10/2
please enter an actual number
-4

见和<在Ruby v2.6中，code>Kernel#Integer被赋予了可选参数

exception:false

使用

循环

的一个优点是它提供了一定程度的数据封装。与

while

和

until

不同，

loop

获取一个块，从而避免窥视块内定义的局部变量的值。除了

循环

之外，我很少使用任何东西进行循环