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Merge pull request #312 from jonaslu/add_metadata_reader_macro_in_docs

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Update guide with note on reader macro with-meta
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Joel Martin 2018-01-02 09:51:23 -06:00 committed by GitHub
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process/guide.md
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@ -1527,6 +1527,11 @@ diff -urp ../process/step9_try.txt ../process/stepA_mal.txt
returned that has its `meta` attribute set to the second argument.
Note that it is important that the environment and macro attribute
of mal function are retained when it is copied.
* Add a reader-macro that expands the token "^" to
return a new list that contains the symbol "with-meta" and the
result of reading the next next form (2nd argument) (`read_form`) and the
next form (1st argument) in that order
(metadata comes first with the ^ macro and the function second).
* Add a new "\*host-language\*" (symbol) entry to your REPL
environment. The value of this entry should be a mal string