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Ruby Hash keys()用法及代码示例


Hash#keys()是一种Hash类方法,它提供一个数组,其中包含哈希中存在的所有键。

用法:Hash.keys()

参数:散列值


返回:哈希中存在所有键的数组

示例1:

# Ruby code for Hash.keys() method 
  
# declaring Hash value 
a = {a:100, b:200} 
  
# declaring Hash value 
b = {a:100, c:300, b:200} 
  
# declaring Hash value 
c = {a:100} 
  
  
# keys Value 
puts "Hash a keys form : #{a.keys()}\n\n"
  
puts "Hash b keys form : #{b.keys()}\n\n"
  
puts "Hash c keys form : #{c.keys()}\n\n"

输出:

Hash a keys form : [:a, :b]

Hash b keys form : [:a, :c, :b]

Hash c keys form : [:a]

示例2:

# Ruby code for Hash.keys() method 
  
# declaring Hash value 
a = { "a" => 100, "b" => 200 } 
  
# declaring Hash value 
b = {"a" => 100} 
  
# declaring Hash value 
c = {"a" => 100, "c" => 300, "b" => 200} 
  
  
# keys Value 
puts "Hash a keys form : #{a.keys()}\n\n"
  
puts "Hash b keys form : #{b.keys()}\n\n"
  
puts "Hash c keys form : #{c.keys()}\n\n"

输出:

Hash a keys form : ["a", "b"]

Hash b keys form : ["a"]

Hash c keys form : ["a", "c", "b"]



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注:本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Ruby | Hash keys() 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。