add pend builtin function

1 files changed, 35 insertions, 0 deletions

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+(, a b)
+pend.
+concatenates arrays, but enlists anything that isnt already an array
+thus 
+	(, x xs) (, xs x) is like append or prepend
+	(, x y) is pair
+	(, x) is enlist
+	(, xs ys) is extend
+if you really want an array to be inside another array
+	you can do (, xs (, ys)) or equivalently (, xs [ys])
+	this is probably the rarer case so that's good
+this always returns (allocates) a new object. that's probably fine
+most of the time
+if you want it to modify inplace have a (,! ...) form
+but need to specify which one to modify ...
+	(,! x xs) (,! xs x) are unambiguous
+	but should (,! xs ys) copy ys to xs or vice versa?
+	maybe something like (,!< xs ys) (,!> xs ys) respectively
+	or maybe more generally (,! xs (! ys)) but that's uglier
+	(,! xs !ys) ???
+this also does string concatenation. 
+have a variant (,, ...) maybe that puts spaces in between
+have a variant that uniions hashes
+	does (, {'x 10} {'y 20}) do {'x 10 'y 20} or [{'x 10} {'y 20}] ?
+	probably see which is commoner
+
+
+
+separate strings from symbols
+symbols are atomic and interned
+strings are just arrays of characters (codepoints)
+
+
+
+