Source   Edit  

loops and iterators

TLDR

• iterators are included, as their only used with loops
  • the parallel iterator is in asyncParMem

links

• iterators
• iterator tut
• closureScope
• status iterator docs
• system io iterators

TODOs

• nim by example: closure iterators
• iterToProc

loop/iterator related procs

• finished determine if a first class iterator has finished
• countup == .. == ..< (zero index countup)
• countdown == ..^ == ..^1 (zero index countdown)
• items for i blah.items: always called if only 1 identifer is used
• pairs for i,z blah.pairs: always called if two identifiers are used
• low(blah) .. high(blah)
• lines(somefile) each line in the file

iterators

• inlined at the callsite when compiled
  • do not have the overhead from function calling
  • prone to code bloat
  • useful for defining custom loops on complex objects
• can be used as operators if you enclose the name in back ticks
• can be wrapped in a proc with the same name to accumulate the result and return it as a seq
• distinction with procs
  • can only be called from loops
  • uses yield instead of return keyword
  • doesnt have an implicit result
  • dont support recursion
  • cant be forward declared