Multi-assignment might be nice about rock

[maximeg]

This will be interesting if it'll be compatible with function return.

some: func -> (Int, Int, Int) {
  return (1, 2, 3)
}

(a, b, c) := some()

And as usual, the notation of the type of returned value could be shortened in "-> Int" in case of same type for the n.

There's tons of possible examples.
One ramdomly picked and a bit stupid : a function that diagonalize a matrix and return the diagonalized matrix and the base changement matrix.

(excuse my english math...)

[nddrylliog]

Yes, yes that's definitely the spirit. We need an ORC on that.

[danopia]

So it would be like tuples in other languages? As in immutable arrays?

[nddrylliog]

Well, even if they're only used in 1) assignment and 2) function retuns, they would still be pretty useful. Having them as a real data-type isn't really needed imho, we have arrays for that.

[wandernauta]

Using multi-assignment for swapping values would be nice too:

(a, b) = (b, a)

How cool is that?

[solson]

It's cool, but is it needed? Where is that ever really necessary?

[nddrylliog]

Where is it ever necessary? Well, not that often, but often enough to justify it.

Turns out, it's really really easy to implement now that nagaqueen parses tuples and that rock has an AST node for it anyway. Just a matter of matching the left and right arguments, and creating a temp variable if needed.

A child could do it. Anyone wanna give it a try or do you prefer if I handle it?

[nddrylliog]

Fully implemented multi-assign. Closed by f1ecc49