Ruby Hash key?()用法及代碼示例

Hash＃key？()是一種Hash類方法，用於檢查與該值對應的鍵是否存在。

用法：Hash.key?()

參數：散列值

返回：true-如果存在與值對應的鍵，否則返回false

範例1：

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

輸出：

Hash a key? form:true

Hash b key? form:false

Hash c key? form:false

範例2：

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

輸出：

Hash a key? form:true

Hash b key? form:false

Hash c key? form:true

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 key?() 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。