Effective Solutions for SML Programming Issues
Discover effective solutions for common SML programming issues, including local variable definition, mutual recursion, and utilizing SML documentation to enhance your coding skills and avoid redundant implementations.
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Presentation Transcript
CSE 341 Section 3 Justin Harjanto
Agenda HW2 Issues SML Docs for HW3 More functions Java 8 Streams
The problem fun earlier x = ... other x ... fun later x = ... other x ... fun other x = earlier x ... later x ... The above doesn t work because earlier and later don t have reference to the other binding!
Solutions? If earlier and later aren t used anywhere else, then have other define them locally instead! fun other x = let fun earlier x ... fun later x ... in earlier x ... later x ... end
Or use mutual recursion! In HW2, there are some problems where you want this This is a common idiom in SML and other languages Mutual recursion uses the and keyword fun even 0 = true | even n = odd (n - 1) and odd 0 = false | odd n = even (n - 1)
SML Docs Useful skill to look at docs! Don t want to reimplement something that s already in standard lib Two of the most useful pages for this next homework: http://sml-family.org/Basis/string.html http://sml-family.org/Basis/list.html
Higher Order Functions See code!
