红宝石 |数组一？（）函数

Array#one?() : one?()是一种 Array 类方法，用于检查数组是否只有一个数组元素。

Syntax: Array.one?()

Parameter: Array

Return: true – if array has only one element otherwise return false.

示例 #1：

# Ruby code for one?() method
  
# declaring array
a = [18, 22, 33, nil, 5, 6]
  
# declaring array
b = [1, 4, 1, 1, 88, 9]
  
# declaring array
c = [2]
  
# one? method example
puts "one?() method form : #{a.one?()}\n\n"
  
puts "one?() method form : #{b.one?()}\n\n"
  
puts "one?() method form : #{c.one?()}\n\n"

输出 ：

one?() method form : false

one?() method form : false

one?() method form : true

示例 #2：

# Ruby code for one?() method
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
c = ["cow"]
  
# declaring array
b = ["cow", nil, "dog"]
  
  
# one? method example
puts "one?() method form : #{a.one?()}\n\n"
  
puts "one?() method form : #{b.one?()}\n\n"
  
puts "one?() method form : #{c.one?()}\n\n"

输出 ：

one?() method form : false

one?() method form : false

one?() method form : true