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doc: Document pattern matching on vectors #4589

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Jan 23, 2013
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doc: Document pattern matching on vectors #4589

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12 changes: 12 additions & 0 deletions doc/tutorial.md
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Expand Up @@ -1226,6 +1226,18 @@ match crayons[0] {
}
~~~~

A vector can be destructured using pattern matching:

~~~~
let numbers: [int * 3] = [1, 2, 3];
let score = match numbers {
[] => 0,
[a] => a * 10,
[a, b] => a * 6 + b * 4,
[a, b, c, ..rest] => a * 5 + b * 3 + c * 2 + rest.len() as int
};
~~~~

The elements of a vector _inherit the mutability of the vector_,
and as such, individual elements may not be reassigned when the
vector lives in an immutable slot.
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