Ruby Hash length()方法
Hash#length() : length()是一个Hash类的方法,它给出了哈希中键值对的数量。
语法。Hash.length()
参数:哈希值
返回:散列中的键值对的数量
例子 #1 :
# Ruby code for Hash.length() 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}
# length Value
puts "Hash a length form : #{a.length}\n\n"
puts "Hash b length form : #{b.length}\n\n"
puts "Hash c length form : #{c.length}\n\n"
输出:
Hash a length form : 2
Hash b length form : 3
Hash c length form : 1
例子 #2 :
# Ruby code for Hash.length() 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}
# length Value
puts "Hash a length form : #{a.length}\n\n"
puts "Hash b length form : #{b.length}\n\n"
puts "Hash c length form : #{c.length}\n\n"
输出:
Hash a length form : 2
Hash b length form : 1
Hash c length form : 3