Re: Multi-assign
- Posted by mattlewis (admin) Nov 15, 2011
- 2683 views
I don't really understand what multiple assignment is; but if you use a dollar sign in a sequence could it be confused with the last position of a sequence for example: seq[1..$]
Multiple assignment is a way to take the result of an expression that is a sequence, probably most commonly the return value of a sequence, and assign it in one go, without having to use a temporary variable. So:
-- instead of: x = value( something ) my_number = x[2] -- you could do: { $, my_number } = value( something )
The confusion was the argument brought up, but I'm honestly not sure how one would confuse this. Also, $ can already be used as a list terminator:
constant A = 1, B = 2, $ sequence s = { 1, 2, 3, $ }
So, it's basically a place holder. Personally, I like it better than something like an underscore or a dash or a dot because as a glyph, it's fairly substantial and easy to spot and differentiate from other things.
Matt
