How do you do an in-place drop in Ruby

Can anyb开发者_开发技巧ody explain why Array in Ruby doesn't have a drop! method?

Is there a way to drop or slice an array in place?

There's slice!. It can take an index (just like drop, so slice!(index) is the in-place drop you're looking for), a range, or two parameters for start and end.

You can use slice! with a range to accomplish this:

a = [1, 2, 3, 4]
a.drop(2)
=> [3, 4]
a
=> [1, 2, 3, 4]

vs

a = [1, 2, 3, 4]
a.slice!(0..1)
=> [1, 2]
a
=> [3, 4]