Ruby Hash compare_by_identity()用法及代码示例

Hash＃compare_by_identity()是一种Hash类方法，该方法将哈希键及其标识进行比较，并将完全相同的对象视为相同的键。

用法：Hash.compare_by_identity ()

参数：哈希数组

返回：比较哈希键及其身份

范例1：

# Ruby code for compare_by_identity () method 
  
# declaring Hash value 
a = {a:100, b:nil} 
  
# declaring Hash value 
b = {a:100, c:nil, b:"b"} 
  
# declaring Hash value 
c = {a:100} 
  
puts "compare_by_identity  a:#{a.compare_by_identity}\n\n"
  
puts "compare_by_identity  b:#{b.compare_by_identity}\n\n"
  
puts "compare_by_identity  b:#{c.compare_by_identity}\n\n"

输出：

compare_by_identity  a:{:a=>100,:b=>nil}

compare_by_identity  b:{:a=>100,:c=>nil,:b=>"b"}

compare_by_identity  b:{:a=>100}

范例2：

# Ruby code for compare_by_identity () method 
  
# declaring Hash value 
a = { "a" => 100, "b" => 200 } 
  
# declaring Hash value 
b = {"a" => 100} 
  
# declaring Hash value 
c = {"a" => 100, "c" => "c", "b" => 200} 
  
puts "compare_by_identity  a:#{a.compare_by_identity}\n\n"
  
puts "compare_by_identity  b:#{b.compare_by_identity}\n\n"
  
puts "compare_by_identity  b:#{c.compare_by_identity}\n\n"

输出：

compare_by_identity  a:{"a"=>100, "b"=>200}

compare_by_identity  b:{"a"=>100}

compare_by_identity  b:{"a"=>100, "c"=>"c", "b"=>200}

相关用法

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 compare_by_identity () 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。