Ruby Hash empty?用法及代碼示例

Hash＃empty？()是一種Hash類方法，用於檢查Hash數組是否具有任何鍵值對。

用法：Hash.empty?()

參數：散列值

返回：true-如果沒有鍵值對，否則返回false

範例1：

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

輸出：

Hash a empty? form:false

Hash b empty? form:false

Hash c empty? form:false

範例2：

# Ruby code for Hash.empty?() method 
   
# declaring Hash value 
a = { "a" => 100, "b" => 200 } 
   
# declaring Hash value 
b = {} 
   
# declaring Hash value 
c = {"a" => 100, "c" => 300, "b" => 200} 
   
# emoty? Value 
puts "Hash a empty? form:#{a.empty?()}\n\n"
   
puts "Hash b empty? form:#{b.empty?()}\n\n"
   
puts "Hash c empty? form:#{c.empty?()}\n\n"

輸出：

Hash a empty? form:false

Hash b empty? form:true

Hash c empty? form:false

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 empty? 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。