Re: Truncate an array

Ruby
1

SOME_ARRAY = [1, 2, 3]

  1. SOME_ARRAY.each_index{|i| SOME_ARRAY[i].nil}.compact!
  2. SOME_ARRAY.slice!(1…0)

=> SOME_ARRAY == []

SOME_ARRAY = []

Regards,

Dan

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2

I’d thought about that too. This is bad for two reasons.

  1. SOME_ARRAY is ‘supposedly’ a constant, in that ruby complains if
    you assign to it more than once.

  2. We didn’t really truncate the array, just made a new empty one.

SOME_ARRAY = [1,2,3]
a = SOME_ARRAY
SOME_ARRAY = []
p a
=> [1, 2, 3]

As opposed to something like:
a = SOME_ARRAY
SOME_ARRAY.length.times{SOME_ARRAY.shift}
p a
=> []