match expressions
somewhat like
"switch - case" function in C
match <expression> with <match>
e.g.
match <expression> with
<pattern 1> -> <expression1> |
<pattern 2> -> <expression2> |
...
<pattern N> -> <expression N>
when you get a warning that says,
"this pattern-matching is not exhaustive"
what it means is that it does not cover "all possibilities"
to which you may add
| _ -> something
"| _ "
this means "anything else not specified"
WRITTEN BY
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