From: jim <jim@web>
Date: Sun, 8 Feb 2015 23:44:13 +0000 (-0500)
Subject: create page
X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=dea3d44a63cf46683806bc739fe236fd238b1374;ds=sidebyside

create page
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+## Comprehensions
+
+3. Using either Kapulet's or Haskell's list comprehension syntax, write an expression that transforms `[3, 1, 0, 2]` into `[3, 3, 3, 1, 2, 2]`.
+
+*Here is a hint*
+
+Define a function `dup (n, x)` that creates a list of *n* copies of `x`. Then use list comprehensions to transform `[3, 1, 0, 2]` into `[[3, 3, 3], [1], [], [2, 2]]`. Then use `join` to "flatten" the result.
+
+## Lists
+
+7. Continuing to encode lists in terms of their left-folds, how should we write `head`? This is challenging.
+
+*Here is a hint*