apropos-cast/00 Show notes.md

## 00 Show notes.md

      
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              00 Show notes.md
            
          
    Show Notes

Topics

Follow-up on tagged literals from last episode

Tagged Literal type (added Clojure 1.8, 2018): https://insideclojure.org/2018/06/21/tagged-literal/
(set! *default-data-reader-fn* tagged-literal)
Malli

https://github.com/metosin/malli
Update on Grokking Simplicity (Eric's book)


Link: https://lispcast.com/gs

Dynamically implementing protocols


Tweet from @puredanger (Alex Miller): https://twitter.com/puredanger/status/1368949555945893890
Link from Tommi Reiman: https://github.com/metosin/malli/blob/master/src/malli/core.cljc#L295-L308

REPL Time!!


Problem link: https://gist.github.com/ericnormand/c9056ff19a066038137f60dd4c28ac6e

Pattern matching
When describing rhyming patterns, poets use letters to define patterns, like this:
Roses are red A

Violets are blue B

Sugar is sweet C

and so are you B
This poem has an ABCB rhyming structure because the B lines rhyme and A and C do not.
We'll use this same naming scheme but use equality instead of rhyming. Write a function that takes a sequence of values and a pattern string. It returns a a map of letters to values if the pattern matches, and nil if it does not.
Examples:
(pattern [1 2 1 2] "ABAB") ;=> {\A 1 \B 2}
(pattern [1 2 3 2] "ABCB") ;=> {\A 1 \B 2 \C 3}
(pattern [1 2 3 4] "ABAB") ;=> nil
(pattern [1 1 1 1] "A") ;=> nil (wrong number of elements)
(pattern [1 1 1 1] "ABCD") ;=> {\A 1 \B 1 \C 1 \D 1}
(pattern [1 4 2 1] "ADCA") ;=> {\A 1 \D 4 \C 2}
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