Who said that pure functions should be newcomer friendly? Swift attributes are way at the end of the swift’s book. Using the -> arrow at first won’t break anything. If one would optimize some functions by annotating them to be pure, the change to something like ~> would be really easy.
IMHO clustering the whole code with hundred’s of different attributes isn’t the right way either. Purity could be easily be expressed throw the arrow, plus it enforces you to have a return type (other than Void). -- Adrian Zubarev Sent with Airmail Am 17. Februar 2017 um 18:59:17, Nicolas Fezans (nicolas.fez...@gmail.com) schrieb: The arrow proposals -> vs. ~> vs. => are not really much shorter than the 4 letters of the pure keyword but just confusing and frightening for newcomers (BTW __pure exists in GCC if I remember well) whereas "pure func" is something that people can easily google in case they need to learn the concept. The different arrows are very compact but feel a bit like J, which is a language I would not like swift to look like.
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