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Extension
Monadic composition of side-effects
Examples
IO{ "did a side effect".postln }.unsafePerformIO IO{ "did a side effect, but will return 32".postln; 32 }.collect(_*10).unsafePerformIO // compose two side-effects x = IO{ "did a".postln; Unit } >>=| IO{ "did b".postln; Unit } x.unsafePerformIO // do 3 side-effects, i.e. fetch values from a file and run a 3-argument functon on the result: // IO is an instance of the Monad type class, therefore is also an applicative functor. // note, with IO the 3 actions are done sequentially, not in parallel. For that one would use a promise x = { |x,y,z| x + y + y } <%> IO{"accessing file1".postln;1} <*> IO{"accessing file2".postln;2} <*> IO{"accessing file3".postln;3}; x.unsafePerformIO
helpfile source:
HelpSource/Classes/IO.schelp
link::FPLib/Classes/IO::
