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<ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="notation.html"><strong aria-hidden="true">1.</strong> Notation</a></li><li><a href="lexical-structure.html"><strong aria-hidden="true">2.</strong> Lexical structure</a></li><li><ol class="section"><li><a href="input-format.html"><strong aria-hidden="true">2.1.</strong> Input format</a></li><li><a href="keywords.html"><strong aria-hidden="true">2.2.</strong> Keywords</a></li><li><a href="identifiers.html"><strong aria-hidden="true">2.3.</strong> Identifiers</a></li><li><a href="comments.html"><strong aria-hidden="true">2.4.</strong> Comments</a></li><li><a href="whitespace.html"><strong aria-hidden="true">2.5.</strong> Whitespace</a></li><li><a href="tokens.html"><strong aria-hidden="true">2.6.</strong> Tokens</a></li><li><a href="paths.html"><strong aria-hidden="true">2.7.</strong> Paths</a></li></ol></li><li><a href="macros.html"><strong aria-hidden="true">3.</strong> Macros</a></li><li><ol class="section"><li><a href="macros-by-example.html"><strong aria-hidden="true">3.1.</strong> Macros By Example</a></li><li><a href="procedural-macros.html"><strong aria-hidden="true">3.2.</strong> Procedural Macros</a></li></ol></li><li><a href="crates-and-source-files.html"><strong aria-hidden="true">4.</strong> Crates and source files</a></li><li><a href="conditional-compilation.html"><strong aria-hidden="true">5.</strong> Conditional compilation</a></li><li><a href="items.html"><strong aria-hidden="true">6.</strong> Items</a></li><li><ol class="section"><li><a href="items/modules.html"><strong aria-hidden="true">6.1.</strong> Modules</a></li><li><a href="items/extern-crates.html"><strong aria-hidden="true">6.2.</strong> Extern crates</a></li><li><a href="items/use-declarations.html"><strong aria-hidden="true">6.3.</strong> Use declarations</a></li><li><a href="items/functions.html"><strong aria-hidden="true">6.4.</strong> Functions</a></li><li><a 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class="active"><strong aria-hidden="true">8.2.16.</strong> If and if let expressions</a></li><li><a href="expressions/match-expr.html"><strong aria-hidden="true">8.2.17.</strong> Match expressions</a></li><li><a href="expressions/return-expr.html"><strong aria-hidden="true">8.2.18.</strong> Return expressions</a></li></ol></li></ol></li><li><a href="patterns.html"><strong aria-hidden="true">9.</strong> Patterns</a></li><li><a href="type-system.html"><strong aria-hidden="true">10.</strong> Type system</a></li><li><ol class="section"><li><a href="types.html"><strong aria-hidden="true">10.1.</strong> Types</a></li><li><ol class="section"><li><a href="types/boolean.html"><strong aria-hidden="true">10.1.1.</strong> Boolean type</a></li><li><a href="types/numeric.html"><strong aria-hidden="true">10.1.2.</strong> Numeric types</a></li><li><a href="types/textual.html"><strong aria-hidden="true">10.1.3.</strong> Textual types</a></li><li><a href="types/never.html"><strong 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<a class="header" href="expressions/if-expr.html#if-and-if-let-expressions" id="if-and-if-let-expressions"><h1><code>if</code> and <code>if let</code> expressions</h1></a>
<a class="header" href="expressions/if-expr.html#if-expressions" id="if-expressions"><h2><code>if</code> expressions</h2></a>
<blockquote>
<p><strong><sup>Syntax</sup></strong><br />
<em>IfExpression</em> :<br />
<code>if</code> <a href="expressions.html"><em>Expression</em></a><sub><em>except struct expression</em></sub> <a href="expressions/block-expr.html"><em>BlockExpression</em></a><br />
(<code>else</code> (
<a href="expressions/block-expr.html"><em>BlockExpression</em></a>
| <em>IfExpression</em>
| <em>IfLetExpression</em> ) )<sup>?</sup></p>
</blockquote>
<p>An <code>if</code> expression is a conditional branch in program control. The form of an
<code>if</code> expression is a condition expression, followed by a consequent block, any
number of <code>else if</code> conditions and blocks, and an optional trailing <code>else</code>
block. The condition expressions must have type <code>bool</code>. If a condition
expression evaluates to <code>true</code>, the consequent block is executed and any
subsequent <code>else if</code> or <code>else</code> block is skipped. If a condition expression
evaluates to <code>false</code>, the consequent block is skipped and any subsequent <code>else if</code> condition is evaluated. If all <code>if</code> and <code>else if</code> conditions evaluate to
<code>false</code> then any <code>else</code> block is executed. An if expression evaluates to the
same value as the executed block, or <code>()</code> if no block is evaluated. An <code>if</code>
expression must have the same type in all situations.</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
# let x = 3;
if x == 4 {
println!("x is four");
} else if x == 3 {
println!("x is three");
} else {
println!("x is something else");
}
let y = if 12 * 15 > 150 {
"Bigger"
} else {
"Smaller"
};
assert_eq!(y, "Bigger");
#}</code></pre></pre>
<a class="header" href="expressions/if-expr.html#if-let-expressions" id="if-let-expressions"><h2><code>if let</code> expressions</h2></a>
<blockquote>
<p><strong><sup>Syntax</sup></strong><br />
<em>IfLetExpression</em> :<br />
<code>if</code> <code>let</code> <a href="expressions/match-expr.html"><em>MatchArmPatterns</em></a> <code>=</code> <a href="expressions.html"><em>Expression</em></a><sub><em>except struct or lazy boolean operator expression</em></sub>
<a href="expressions/block-expr.html"><em>BlockExpression</em></a><br />
(<code>else</code> (
<a href="expressions/block-expr.html"><em>BlockExpression</em></a>
| <em>IfExpression</em>
| <em>IfLetExpression</em> ) )<sup>?</sup></p>
</blockquote>
<p>An <code>if let</code> expression is semantically similar to an <code>if</code> expression but in
place of a condition expression it expects the keyword <code>let</code> followed by a
pattern, an <code>=</code> and a <a href="glossary.html#scrutinee">scrutinee</a> expression. If the value of the scrutinee
matches the pattern, the corresponding block will execute. Otherwise, flow
proceeds to the following <code>else</code> block if it exists. Like <code>if</code> expressions,
<code>if let</code> expressions have a value determined by the block that is evaluated.</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
let dish = ("Ham", "Eggs");
// this body will be skipped because the pattern is refuted
if let ("Bacon", b) = dish {
println!("Bacon is served with {}", b);
} else {
// This block is evaluated instead.
println!("No bacon will be served");
}
// this body will execute
if let ("Ham", b) = dish {
println!("Ham is served with {}", b);
}
if let _ = 5 {
println!("Irrefutable patterns are always true");
}
#}</code></pre></pre>
<p><code>if</code> and <code>if let</code> expressions can be intermixed:</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
let x = Some(3);
let a = if let Some(1) = x {
1
} else if x == Some(2) {
2
} else if let Some(y) = x {
y
} else {
-1
};
assert_eq!(a, 3);
#}</code></pre></pre>
<p>An <code>if let</code> expression is equivalent to a <a href="expressions/match-expr.html"><code>match</code> expression</a> as follows:</p>
<pre><code class="language-rust ignore">if let PATS = EXPR {
/* body */
} else {
/*else */
}
</code></pre>
<p>is equivalent to</p>
<pre><code class="language-rust ignore">match EXPR {
PATS => { /* body */ },
_ => { /* else */ }, // () if there is no else
}
</code></pre>
<p>Multiple patterns may be specified with the <code>|</code> operator. This has the same semantics
as with <code>|</code> in <code>match</code> expressions:</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
enum E {
X(u8),
Y(u8),
Z(u8),
}
let v = E::Y(12);
if let E::X(n) | E::Y(n) = v {
assert_eq!(n, 12);
}
#}</code></pre></pre>
<p>The expression cannot be a <a href="expressions/operator-expr.html#lazy-boolean-operators">lazy boolean operator expression</a>.
Use of a lazy boolean operator is ambiguous with a planned feature change
of the language (the implementation of if-let chains - see <a href="https://github.com/rust-lang/rfcs/blob/master/text/2497-if-let-chains.md#rollout-plan-and-transitioning-to-rust-2018">eRFC 2947</a>).
When lazy boolean operator expression is desired, this can be achieved
by using parenthesis as below:</p>
<pre><code class="language-rust ignore">// Before...
if let PAT = EXPR && EXPR { .. }
// After...
if let PAT = ( EXPR && EXPR ) { .. }
// Before...
if let PAT = EXPR || EXPR { .. }
// After...
if let PAT = ( EXPR || EXPR ) { .. }
</code></pre>
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