Hash#has_key?()是一种哈希类方法,用于检查哈希中是否存在给定 key 。
用法:Hash.has_key?()
参数:散列值
返回:true-如果存在 key ,则返回false
范例1:
# Ruby code for Hash.has_key?() 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}
# has_key? Value
puts "Hash a has_key? form:#{a.has_key?("a")}\n\n"
puts "Hash b has_key? form:#{b.has_key?("c")}\n\n"
puts "Hash c has_key? form:#{c.has_key?("v")}\n\n"
输出:
Hash a has_key? form:false Hash b has_key? form:false Hash c has_key? form:false
范例2:
# Ruby code for Hash.has_key?() 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}
# has_key? Value
puts "Hash a has_key? form:#{a.has_key?("a")}\n\n"
puts "Hash b has_key? form:#{b.has_key?("c")}\n\n"
puts "Hash c has_key? form:#{c.has_key?("v")}\n\n"
输出:
Hash a has_key? form:true Hash b has_key? form:false Hash c has_key? form:false
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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 has_key?() 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。