e8f857cc19
Currently, a common way to generate an inclusive range is to use `in-range`, but users need to figure out an appropriate upper bound, which (1) is error-prone and (2) obscures the intention. As an example, https://docs.racket-lang.org/pict/Animation_Helpers.html uses `(in-range 0 1.2 0.2)` to generate `'(0 0.2 0.4 0.6 0.8 1.0)`. It is also quite common to use `(in-range 1 (add1 n))` to generate `(list 1 2 ... n)`. Both examples are subpar. This PR adds `in-inclusive-range` as a counterpart to `in-range`, and `inclusive-range` as a counterpart to `range`, to make inclusive range construction easier. An alternative API is to modify `in-range` to accept a keyword argument like `#:inclusive? #t`, but this is more verbose and no other sequence generating function accepts keyword arguments. Therefore, I think `(in-)inclusive-range` is more appropriate. |
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