如何在Ruby中删除数组的结尾

Question

Array#drop删除数组的前n个元素.删除数组的最后m个元素有什么好方法？或者,保持数组中间元素(大于n,小于m)的好方法是什么？

Answer 1

这正是Array#pop为了:

x = [1,2,3]
x.pop(2) # => [2,3]
x # => [1]

Answer 2

您也可以使用Array#slice方法,例如:

[1,2,3,4,5,6].slice(1..4) # => [2, 3, 4, 5]

要么

a = [1,2,3,4,5,6]
a.take 3 # => [1, 2, 3]
a.first 3 # => [1, 2, 3]
a.first a.size - 1 # to get rid of the last one