红宝石 |哈希成员？函数

Hash# 成员?()是一个 Hash 类方法，它检查给定的键是否存在于 hash is not 中。

Syntax: Hash.member?()

Parameter: Hash values

Return: true – if given key is present in hash otherwise return false

示例 #1：

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

输出 ：

Hash a member? form : false

Hash b member? form : false

Hash c member? form : false

示例 #2：

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

输出 ：

Hash a member? form : true

Hash b member? form : false

Hash c member? form : true