如何打印如何打印數組的所有元素的第二個元素除權後陣列

Question

的最後一個要素：

ARR=["a","b","c","d","f"] 

我想打印CDF

ARR=["cat","dog","horse"] 

我想打印馬

在此先感謝

Answer 1

使用Array#[]與範圍或Array#drop

arr = ["a","b","c","d","f"] 
arr[2..-1] 
# => ["c", "d", "f"] 
arr.drop(2) 
# => ["c", "d", "f"] 

arr = ["cat","dog","horse"] 
arr[2..-1] 
# => ["horse"] 
arr.drop(2) 
# => ["horse"] 

Answer 2

一樣簡單
p ARR[2..-1] 其中2和-1是一個元素的索引。

Answer 3

使用Array#last方法

arr.last(arr.size - 2)