红宝石 |数组 unshift()函数

Array#unshift() : unshift()是一个 Array 类方法，它返回带有参数元素的移位数组。

Syntax: Array.unshift()
Parameter: Array
Return: the shifted array with argumented element in place.

示例 #1：

Ruby

# Ruby code for unshift() method
 
# declaring array
a = [18, 22, 33, nil, 5, 6]
 
# declaring array
b = [1, 4, 1, 1, 88, 9]
 
# declaring array
c = [18, 22, 50, 6]
 
# unshift method example
puts "unshift() method form : #{a.unshift(2)}\n\n"
 
puts "unshift() method form : #{b.unshift(4)}\n\n"
 
puts "unshift() method form : #{c.unshift(22)}\n\n"

输出 ：

unshift() method form : [2, 18, 22, 33, nil, 5, 6]

unshift() method form : [4, 1, 4, 1, 1, 88, 9]

unshift() method form : [22, 18, 22, 50, 6]

示例 #2：

红宝石

# Ruby code for unshift() method
 
# declaring array
a = ["abc", "nil", "dog", "abc"]
 
# declaring array
b = ["cow", nil, "abc", "dog"]
 
# declaring array
c = ["cat", nil, "abc"]
 
 
 
# unshift method example
puts "unshift() method form : #{a.unshift("abc")}\n\n"
 
puts "unshift() method form : #{b.unshift()}\n\n"
 
puts "unshift() method form : #{c.unshift()}\n\n"

输出 ：

unshift() method form : ["abc", "abc", "nil", "dog", "abc"]

unshift() method form : ["cow", nil, "abc", "dog"]

unshift() method form : ["cat", nil, "abc"]