红宝石 |哈希 shift() 方法
Hash#shift()是一个 Hash 类方法,它从哈希中删除一个键值对,然后将这些值作为两项数组返回。
Syntax: Hash.shift()
Parameter: Hash values
Return: two-item [key-value] array
示例 #1:
# Ruby code for Hash.shift() method
# declaring Hash value
a = {a:455, b:200}
# declaring Hash value
b = {e:500, c:300, b:200}
# declaring Hash value
c = {a:100}
# shift Value
puts "Hash a shift form : #{a.shift()}\n\n"
puts "Hash b shift form : #{b.shift()}\n\n"
puts "Hash c shift form : #{c.shift()}\n\n"
输出 :
Hash a shift form : [:a, 455]
Hash b shift form : [:e, 500]
Hash c shift form : [:a, 100]
示例 #2:
# Ruby code for Hash.shift() method
# declaring Hash value
a = { "a" => 344, "b" => 200 }
# declaring Hash value
b = {"a" => 100}
# declaring Hash value
c = {"e" => 100, "c" => 300, "b" => 200}
# shift Value
puts "Hash a shift form : #{a.shift()}\n\n"
puts "Hash b shift form : #{b.shift()}\n\n"
puts "Hash c shift form : #{c.shift()}\n\n"
输出 :
Hash a shift form : ["a", 344]
Hash b shift form : ["a", 100]
Hash c shift form : ["e", 100]