Nested Optionals seem to be difficult to do

[jay-babu]

Hello,

I needed to some nested Optionals as there could be multiple nil values. I was wondering if there was an easier way to accomplish the below. Still getting used to this library, but definitely makes my life easier.

local default_handler = Optional.of_nilable(handlers[1])
  :or_(_.always(Optional.of_nilable(default_setup(installed_sources))))

Thanks!

[williamboman]

Hey! So both the functional and optional modules are technically not part of the public Lua API, so use should be done with care (although I don't think it'll be an issue). Not sure what values your example involves, but if default_setup() never returns nil, I'd probably unwrap the optional immediately like so:

local default_handler = Optional.of_nilable(handlers[1]):or_else_get(function ()
    return default_setup(installed_sources)
end)

-- but you probably dont need to use the Optional interface
local default_handler = handlers[1] or default_setup(installed_sources)

[jay-babu]

Yeah,. I forgot to reply last night, but I realized I could just do

Optional.of_nilable(a or b or c)

Feel free to resolve. Thanks!

[jay-babu]

@williamboman, I am okay with modules not being public / stable. It would nice if there was a way to subscribe to breaking changes, or even better to split that portion to another stable repo. I find it very useful

Thanks!