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diff --git a/Lists/README.md b/Lists/README.md index 3daa129..5b892ad 100644 --- a/Lists/README.md +++ b/Lists/README.md @@ -1,17 +1,48 @@ # Lists -Limbo supports lists of a type as a basic construct. +Limbo supports lists of arbitrary types as a basic construct. ## Source -### +### lists.b:16,20 +Three lists are declared. +The `len` statement can be used on a list to return the number of elements in the respective list. Note that the list `persons` is a list of tuples whose pairing is that of a string and an integer. -## Demo +### lists.b:22,28 + +The lists `names` and `ages` are both populated. + +The `::` operator functions on lists by prepending the given element before the head of the current list. Note the interaction between successive calls to the `::` operator prior to assignment and how it affects order. + +### lists.b:30,46 + +The list `persons` is built by making copies of the `names` and `ages` lists as `n` and `a`, respectively. +The `hd` statement returns the head of the list to its right. + +The `tl` statement returns the tail, that is the list bar the head element, of the list to its right. + +An empty list is equivocal to `nil`. That is, a nil list is an empty list. + +Note: The effects upon temporary copies of `names` and `ages` do not affect the original lists they are copies of, as the temporary copies are copies, rather than references to the original lists. + +## Demo + ; limbo lists.b + ; lists + Lens: 0, 0, 0 + Lens: 3, 3, 0 + Persons: + Spike: 27 + Jet: 36 + Ed: 13 + Tmp lens: 0, 0 + Lens: 3, 3, 0 + ; ## Exercises - Try reversing a list. +- Try interleaving two lists. |