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"]
相關用法
- Ruby Hash key?()用法及代碼示例
- Ruby Hash key()用法及代碼示例
- Ruby Hash each()用法及代碼示例
- Ruby Hash eql?用法及代碼示例
- Ruby Hash dig()用法及代碼示例
- Ruby Hash any?()用法及代碼示例
- Ruby Hash keep_if()用法及代碼示例
- Ruby Hash has_key?()用法及代碼示例
- Ruby Hash each_pair()用法及代碼示例
- Ruby Hash inspect()用法及代碼示例
- Ruby Hash has_value?()用法及代碼示例
- Ruby Range hash()用法及代碼示例
- Ruby Matrix hash()用法及代碼示例
- Ruby Hash invert()用法及代碼示例
- Ruby Vector hash()用法及代碼示例
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。