Ruby Hash compare_by_identity()用法及代碼示例

Hash＃compare_by_identity()是一種Hash類方法，該方法將哈希鍵及其標識進行比較，並將完全相同的對象視為相同的鍵。

用法：Hash.compare_by_identity ()

參數：哈希數組

返回：比較哈希鍵及其身份

範例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"

輸出：

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

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

compare_by_identity  b:{:a=>100}

範例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"

輸出：

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

compare_by_identity  b:{"a"=>100}

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

相關用法

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 compare_by_identity () 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。