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--- | ||
title: "Language Design: Naming Conventions – Part 3: Options" | ||
date: 2024-07-05 | ||
page_previous_title: "Naming Conventions – Part 2: Conversion" | ||
page_previous_url: "naming-conventions-conversion" | ||
page_next_title: "Naming Conventions – Part 4: Lookup" | ||
page_next_url: "naming-conventions-lookup" | ||
--- | ||
|
||
<table class="table-medium"> | ||
<thead> | ||
<tr> | ||
<th style="width: 18%">Name</th> | ||
<th>Example</th> | ||
</tr> | ||
</thead> | ||
<tbody> | ||
<tr> | ||
<td><code>or</code></td> | ||
<td class="code">Some(1).or(Some(2)) | ||
<span class="result">--> Some(1)</span> | ||
None.or(Some(2)) | ||
<span class="result">--> Some(2)</span></td> | ||
</tr> | ||
<tr> | ||
<td><code>orElse</code></td> | ||
<td class="code">Some(1).orElse(2) | ||
<span class="result">--> Some(1)</span> | ||
None.orElse(2) | ||
<span class="result">--> Some(2)</span></td> | ||
</tr> | ||
<tr> | ||
<td><code>orGet</code></td> | ||
<td class="code">Some(1).orGet(() -> Some(2)) | ||
<span class="result">--> Some(1)</span> | ||
None.orGet(() -> Some(2)) | ||
<span class="result">--> Some(2)</span> | ||
None.orGet(() -> None) | ||
<span class="result">--> None</span></td> | ||
</tr> | ||
<tr> | ||
<td><code>orElseGet</code></td> | ||
<td class="code">Some(1).orElseGet(() -> 2) | ||
<span class="result">--> Some(1)</span> | ||
None.orElseGet(() -> 2) | ||
<span class="result">--> Some(2)</span></td> | ||
</tr> | ||
<tr> | ||
<td><code>orElsePanic</code></td> | ||
<td class="code">Some(1).orElsePanic() | ||
<span class="result">--> 1</span> | ||
None.orElsePanic() | ||
<span class="result"># program aborts</span></td> | ||
</tr> | ||
<tr> | ||
<td><code>orElsePanicWith</code></td> | ||
<td class="code">Some(1).orElsePanicWith("expected some") | ||
<span class="result">--> 1</span> | ||
None.orElsePanicWith("expected some") | ||
<span class="result"># program aborts with message "expected some"</span></td> | ||
</tr> | ||
</tbody> | ||
</table> | ||
|
||
--- | ||
|
||
Naming scheme: | ||
|
||
- `...Else...` indicates going from `Option[T]` to `T` | ||
- `...Get` indicates a closure argument | ||
- all panicking methods contain `...Panic` |
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