Sam answered your question. Here's how one can usually answer the more
general question...
* The documentation for most Racket modules will usually say what
`require` form you need to import it, assuming that you are using the
`racket/base` language. For example, if you're looking at the
documentation for `make-temporary-file` in your Web browser, such as
with the URL:
https://docs.racket-lang.org/reference/Filesystem.html#(def._((lib._racket%2Ffile..rkt)._make-temporary-file))
then you can usually scroll up, and see the `(require racket/file)`.
The appropriate `require` is usually in the documentation, since the
Scribble documentation tool encourages the library author to put it
there. (BTW, though you'll notice that, in this particular example, the
URL itself already says `racket/file`, but that's only because I used a
direct URL to it; you'll often be looking at things in the documentation
without a direct URL fragment reference to them.)
* Another way you can sometimes find this information using the
documentation is in the search results. For example, if you remember
how to use `make-temporary-file`, but forget which module it's in, you
can quickly see the module in the search results, without clicking
through to the documentation for it. For example, in the search results
for:
https://docs.racket-lang.org/search/index.html?q=make-temporary-file
you'll see:
make-temporary-file provided from racket/file, racket
Some code editor you use might suggest which modules you need to
`require`, or even automatically insert `require` forms for you. But
using that too early can make it a crutch that discourages you from
getting comfortable with using the documentation. Documentation is one
of the biggest fundamentals in software engineering. Try not to rely
too much on automagical conveniences, to do things that you don't
already know how to do manually, or that might need your judgment or
insight.
(BTW, for "professional quality" purposes, one should normally use
`#lang racket/base`, just as in the example you gave, rather than use
`#lang racket`. `#lang racket` is for quick throwaway code or for
illustrating examples, when you don't want to bother saying `require`
much, and don't mind that it adds dependencies on a lot of modules that
you probably don't need.)
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