Ruby Array one?()用法及代码示例

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

用法：Array.one?()

参数：数组

返回：true-如果数组只有一个元素，否则返回false。

范例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

范例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

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注：本文由纯净天空筛选整理自mayank5326大神的英文原创作品 Ruby | Array one?() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。