Ruby 数组unshift()函数

Array#unshift() : unshift() 是Array类的一个方法，它返回带参数元素的移位数组的位置。

语法： Array.unshift()

参数： Array

返回： 带参数元素的移位数组到位。

例子 #1 :

# 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]

例子 #2 :

# 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"]