Ruby Hash has_key?() 函数

Hash#has_key?() 是一个Hash类方法，用于检查给定的键是否存在于Hash中。

语法。Hash.has_key?()

参数：哈希值

返回：true – 如果键存在，否则返回false

例子 #1 :

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

输出:

Hash a has_key? form : false

Hash b has_key? form : false

Hash c has_key? form : false

例子 #2 :

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

输出:

Hash a has_key? form : true

Hash b has_key? form : false

Hash c has_key? form : false