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。