From ebf07da0a502acba5fe29b085c3244834e4e3bf5 Mon Sep 17 00:00:00 2001 From: bluecereal Date: Sat, 21 Jan 2017 02:24:48 -0500 Subject: [PATCH] Update if-let.md --- src/doc/book/if-let.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/doc/book/if-let.md b/src/doc/book/if-let.md index 35808b0ed9f0..2231dddf204d 100644 --- a/src/doc/book/if-let.md +++ b/src/doc/book/if-let.md @@ -1,9 +1,8 @@ % if let -`if let` is a figurative combination of `if` and `let`. `if let` does not literally -mean `if` + `let` to the compiler; it has its own special meaning,which was added for -convenience and as a way to reduce the overhead of certain kinds of pattern matches. - +`if let` allows us to match [patterns][patterns] within the condition of an [if][if]. +As a consequence, we 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`. We want to call a function on it if it’s `Some`, but do nothing if it’s `None`. That looks like this: @@ -82,3 +81,4 @@ while let Some(x) = v.pop() { ``` [patterns]: patterns.html +[if]: if.html