ruby - Array#slice(index, length) 当index+length超出范围时，取数组开头的元素

Question

我正在寻找一种紧凑且可读的方式来使用索引和长度对数组进行切片，但是当索引 + 长度超出范围时，而不是像在数组末尾那样停止


[ "a", "b", "c", "d", "e"].slice(4, 3) #=> ["e"]


我想获取数组开头的元素:


#=> ["e", "a", "b"]


Answer 1

你可以这样做:

index = 4
length = 3
[ "a", "b", "c", "d", "e" ].cycle.take(index + length).last(length)