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| author | Chris Wilson <christopher.j.wilson@gmail.com> | 2018-01-04 15:49:43 -0600 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-01-04 15:49:43 -0600 |
| commit | 9999a30e045f59fe3347b8822f71fff32b3ffc27 (patch) | |
| tree | 30255082eef74fbdc7fedd3b3ba8fc08b4ec4eb9 /standard-ml.html.markdown | |
| parent | 70a36c9bd970b928adde06afb2bd69f6ba8e5d5c (diff) | |
Add `case` expression to SML docs
Show an example of pattern-matching using the case expression.
Diffstat (limited to 'standard-ml.html.markdown')
| -rw-r--r-- | standard-ml.html.markdown | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/standard-ml.html.markdown b/standard-ml.html.markdown index 5db15b5c..b34f1c08 100644 --- a/standard-ml.html.markdown +++ b/standard-ml.html.markdown @@ -6,6 +6,7 @@ contributors: - ["David Pedersen", "http://lonelyproton.com/"] - ["James Baker", "http://www.jbaker.io/"] - ["Leo Zovic", "http://langnostic.inaimathi.ca/"] + - ["Chris Wilson", "http://sencjw.com/"] --- Standard ML is a functional programming language with type inference and some @@ -266,6 +267,16 @@ fun second_elem (x::y::xs) = y fun evenly_positioned_elems (odd::even::xs) = even::evenly_positioned_elems xs | evenly_positioned_elems [odd] = [] (* Base case: throw away *) | evenly_positioned_elems [] = [] (* Base case *) + +(* The case expression can also be used to pattern match and return a value *) +datatype temp = + C of real + | F of real + +fun temp_to_f t = + case t of + C x => x * (9.0 / 5.0) + 32.0 + | F x => x (* When matching on records, you must use their slot names, and you must bind every slot in a record. The order of the slots doesn't matter though. *) |