Ruby Array unshift()用法及代码示例

Array＃unshift()：unshift()是一个Array类方法，该方法返回已移动并带有自变量元素的数组。

用法：Array.unshift()

参数：数组

返回：放置有自变量元素的移位数组。

示例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]

示例2:

# Ruby code for unshift() method 
  
# declaring array 
a = ["abc", "nil", "dog", "abc"] 
  
# declaring array 
c = ["cat", nil, "abc"] 
  
# declaring array 
b = ["cow", nil, "abc", "dog"] 
  
  
# 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"]

相关用法

注：本文由纯净天空筛选整理自mayank5326大神的英文原创作品 Ruby | Array unshift() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。