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added info about tuples, integrated wild card use into a function definition

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Alex Grejuc 2018-07-10 15:12:23 -07:00
parent 0d211d3419
commit 8c30522d58
1 changed files with 9 additions and 6 deletions
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haskell.html.markdown
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@ -124,6 +124,9 @@ last [1..5] -- 5
fst ("haskell", 1) -- "haskell"
snd ("haskell", 1) -- 1
-- pair element accessing does not work on n-tuples (i.e. triple, quadruple, etc)
snd ("snd", "can't touch this", "da na na na") -- error! see function below to get around this
----------------------------------------------------
-- 3. Functions
----------------------------------------------------
@ -159,8 +162,8 @@ fib 1 = 1
fib 2 = 2
fib x = fib (x - 1) + fib (x - 2)
-- Pattern matching on tuples:
foo (x, y) = (x + 1, y + 2)
-- Pattern matching on tuples, using wild card (_) to bypass naming an unused value
sndOfTriple (_, y, _) = y
-- Pattern matching on lists. Here `x` is the first element
-- in the list, and `xs` is the rest of the list. We can write