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Merged
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Feb 6, 2017
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Update if-let.md #38436

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Update if-let.md
bluecereal Dec 17, 2016
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bluecereal Feb 6, 2017
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6 changes: 4 additions & 2 deletions src/doc/book/if-let.md
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
% if let

`if let` allows you to combine `if` and `let` together to reduce the overhead
of certain kinds of pattern matches.
`if let` permits [patterns][pattern] matching within the condition of an [if][if] statement.
This allows us to reduce the overhead of certain kinds of [pattern][patterns] matches
and express them in a more convenient way.

For example, let’s say we have some sort of `Option<T>`. We want to call a function
on it if it’s `Some<T>`, but do nothing if it’s `None`. That looks like this:
Expand Down Expand Up @@ -80,3 +81,4 @@ while let Some(x) = v.pop() {
```

[patterns]: patterns.html
[if]: if.html