first go

README.md

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+# Racket "wat"s
+
+*inspired by Gary Bernhardt's [original "Wat" talk](https://www.destroyallsoftware.com/talks/wat)*
+
+**This repository is a work in progress. If you have anything new wat's to contribute, or
+think one should be removed, please create a pull request!**
+
+# List of wat's
+
+- Numbers are mutable
+
+  ```racket
+Welcome to Racket v7.5.0.900.
+> (immutable? 5)
+#f
+```
+
+- Unquote can be weird:
+
+  ```racket
+Welcome to Racket v7.5.0.900.
+> `(4 . ,(+ 1 2))
+(4 . 3)
+> '(4 . ,(+ 1 2))
+'(4 unquote (+ 1 2))
+```
+
+- Argument order for collections:
+
+  ```racket
+Welcome to Racket v7.5.0.900.
+> (member 'x (list 'x 'y))
+#t
+> (vector-member 'x (vector 'x 'y))
+#t
+> (set-member? (set 'x 'y) 'x)
+#t
+```
+
+- `gensym` is special
+
+  ```racket
+Welcome to Racket v7.5.0.900.
+> (define x (gensym))
+> x
+'g78
+> (eq? x 'g78)
+#f
+```
+
+- `hash-map` doesn't return a hash
+
+  ```racket
+Welcome to Racket v7.5.0.900.
+> (map list '(1 2 3))
+'((1) (2) (3))
+> (vector-map list #(1 2 3))
+'#((1) (2) (3))
+> (hash-map (hash 'x 1 'y 2) list)
+'((x 1) (y 2))  ; that's not a hash map...
+```
+
+- **TODO** more