Ruby Hash key?()用法及代码示例

Hash＃key？()是一种Hash类方法，用于检查与该值对应的键是否存在。

用法：Hash.key?()

参数：散列值

返回：true-如果存在与值对应的键，否则返回false

范例1：

# Ruby code for Hash.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} 
   
   
# key? Value 
puts "Hash a key? form:#{a.key?("a")}\n\n"
   
puts "Hash b key? form:#{b.key?("c")}\n\n"
   
puts "Hash c key? form:#{c.key?("a")}\n\n"

输出：

Hash a key? form:true

Hash b key? form:false

Hash c key? form:false

范例2：

# Ruby code for Hash.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} 
  
# key? Value 
puts "Hash a key? form:#{a.key?("a")}\n\n"
  
puts "Hash b key? form:#{b.key?("c")}\n\n"
  
puts "Hash c key? form:#{c.key?("a")}\n\n"

输出：

Hash a key? form:true

Hash b key? form:false

Hash c key? form:true

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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 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。