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Ruby Hash keys()用法及代碼示例


Hash#keys()是一種Hash類方法,它提供一個數組,其中包含哈希中存在的所有鍵。

用法:Hash.keys()

參數:散列值


返回:哈希中存在所有鍵的數組

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"

輸出:

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"

輸出:

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

Hash b keys form : ["a"]

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



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注:本文由純淨天空篩選整理自Kirti_Mangal大神的英文原創作品 Ruby | Hash keys() function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。