By Gene B. Stafford, Don Greer
Airplane Specials sequence 6011~ Aces of the Southwest Pacific ~
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Topscript , continued (part 15) ∗ all code The distinction here is that type errors will stop you whether or not the offending code is ever actually executed. Merely defining add_potato is an error, whereas is_a_multiple only fails when it's called, and then, only when it's called with an input that triggers the exception. Tuples, lists, options and pattern matching Tuples So far we've encountered a handful of basic types like int, float and string as well as function types like string -> int. But we haven't yet talked about any data structures.
Unfortunately, this code has a problem, as is indicated by the warning message. In particular we don't handle one-element lists. We can fix this warning by adding another case to the match. topscript , continued (part 36) ∗ all code Note that this code used another variant of the list pattern, [hd], to match a list with a single element. , [x;y;z] will match any list with exactly three elements, and will bind those elements to the variables x, y and z. In the last few examples, our list processing code involved a lot of recursive functions.
Here's how we might write a function for testing whether a point is in the interior of some element of a list of scene_elements. x +. y +. topscript , continued (part 48) ∗ all code You might at this point notice that the use of match here is reminiscent of how we used match with option and list. This is no accident: option and list are really just examples of variant types that happen to be important enough to be defined in the standard library (and in the case of lists, to have some special syntax).
Aces of the Southwest Pacific by Gene B. Stafford, Don Greer