红宝石 |哈希 compare_by_identity？ ()函数

比较身份？ ()是一个 Hash 类方法，它检查哈希键与其身份的比较，并将完全相同的对象视为相同的键

Syntax: Hash.compare_by_identity? ()

Parameter: Hash array

Return: true if hash will compare its keys by their identity
otherwise false

示例 #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 : false

compare_by_identity?   b : false

compare_by_identity?   b : false

示例 #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 : false

compare_by_identity?   b : false

compare_by_identity?   b : false