<pawnbox>
I have config var that hash type (compile-time type is (Nil | String | Hash(String, String) | Hash(YAML::Type, YAML::Type) | Array(YAML::Type)))
<pawnbox>
I am not iterate over it.
<pawnbox>
*able
<pawnbox>
even if I check that iterate if config is a Hash
<BlaXpirit>
ugh
<BlaXpirit>
doesn't just YAML::Type work?
<pawnbox>
I am expecting to to be Hash mostly
<BlaXpirit>
this makes no sense to me
<pawnbox>
Well actually that is because Yaml.load return a hash.
<pawnbox>
and config is result of that.
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<pawnbox>
Lemme rephrase.
<pawnbox>
how do i iterate over a var which has compile-time type is (Nil | String | Hash(String, String) | Hash(YAML::Type, YAML::Type) | Array(YAML::Type)).
<pawnbox>
?
<pawnbox>
config.each {...} if config.is_a?(Hash) doesn't work for me.
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<pawnbox>
it says undefined method 'each' for Nil.
<BlaXpirit>
pawnbox, well normally you don't deal with such monstrosity
<askn>
Do you have any suggestions jhass
<BlaXpirit>
you should go further and elaborate on the use case
<jhass>
askn: make a hash to lookup at compile time or generate a case when dispatcher with a macro
<BlaXpirit>
pawnbox, hmm first of all use config.not_nil!.each
<pawnbox>
What exactly doesn't is_a? work with instance variable?
<pawnbox>
asterite:
<pawnbox>
*Why
<asterite>
Because if you do `if @a.is_a?(Hash)` and before executing the next line the program halts that thread and goes to another one and changes the value of @a, your program will behave in a wrong way
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<pawnbox>
Goes to another thread? Why?
<jhass>
in case it's multithreaded?
<jhass>
context switches can happen anywhere then
<pawnbox>
What i don't understand why would if @a.is_a?(X) cause a context switch?
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<jhass>
they're not caused, they happen
<pawnbox>
ok. Guess i need to read up more on is_a?.
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<asterite>
pawnbox: it's not something related to is_a?, it's how operating systems work. They schedule some time to one thread, once that time is up they go to the next thread and so on. It's out of our control to know *when* the OS decides to switch threads, so it can happen just after the is_a? check completed
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<robacarp>
that is a fascinating constraint
<robacarp>
I hadn't considered that instance variables meant they could be volatile
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