Ruby 数组<=>()函数与实例

<=>是一个数组类方法，它在两个数组之间进行比较。

语法。<=>

参数。用于比较的数组

返回：-1：数组小于另一个数组

0：数组等于另一个数组

1：数组大于另一个数组

例子 #1 :

# Ruby code for <=>() method
# showing comparison
  
# declaring array
a = [18, 22, 33, 4, 5, 6]
  
# declaring array
b = [5, 4, 22, 1, 88, 9]
  
# declaring array
c = [18, 22, 33, 40, 50, 6]
  
# 1 as a>b
puts "comparison : #{a <=> b}\n\n"
  
# -1 as a<c
puts "comparison : #{a <=> c}\n\n"
  
# -1 as b<c
puts "comparison : #{b <=> c}\n\n"

输出:

comparison : 1

comparison : -1

comparison : -1

例子 #2 :

# Ruby code for <=>() method
# showing comparison
  
# declaring array
a = ["abc", "xyz", "dog"]
  
# declaring array
b = ["cow", "cat", "dog"]
  
# declaring array
c = ["cat", "1", "dog"]
  
# -1 as a<b
puts "comparison : #{a <=> b}\n\n"
  
# -1 as a<c
puts "comparison : #{a <=> c}\n\n"
  
# 1 as b>c 
puts "comparison : #{b <=> c}\n\n"

输出:

comparison : -1

comparison : -1

comparison : 1