PLAI_Chapter9:Recursion and Cycles: Procedures and Data
9.1RecursiveandCyclicDataRecursionindatacanrefertooneoftwothings.Itcanmeanreferringtosomethingofthesamekind,orreferringtothesamethingitself.Addingrecursivedata,suchaslistsandtrees,toourlanguageisquite