Fill in array with same values

[endragor]

Sometimes you need to fill in the whole array with values different from type defaults. For example, you may have a bool array, and you'd like make it have all true values, instead of all false.
Seems like there is no built-in procedure to do that.

As a workaround, it's possible to use mapIt from sequtils, but it doesn't look straightforward.

[def-]

I don't know, it's not that bad:

var xs {.noinit.}: array[20, bool]
for x in xs.mitems: x = true

[endragor]

test.nim(2, 11) Error: undeclared identifier: 'mitems'

[def-]

Only works in the devel branch, not 0.10.2.

[endragor]

OK, thanks. Still, this would look better:

xs.fill(true)

[reactormonk]

I would prefer

var xs: array[20, bool] = true

[dom96]

Perhaps sequtils could be extended to include array utils as well. But then it should really just be called listutils.

[endragor]

listutils might get confused with lists module that provide linked lists.

[Araq]

@reactormonk Your way is too error prone.

[reactormonk]

@Araq I agree, but it looks nice.

[embg]

I think this is an essential feature; why can python's [False] * 20 be used?

[embg]

*can't

[embg]

Also, since when the array is initialized it has to be filled with something anyway, it would be more efficient to initialize it with the necessary value instead of initializing it with the wrong value and then replacing. There should therefore be a option when the array is initialized to fill it with an arbitrary element.