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|
||
<span class="md-ellipsis">
|
||
Aux
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4" checked>
|
||
|
||
|
||
|
||
<div class="md-nav__link md-nav__container">
|
||
<a href="../../" class="md-nav__link ">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Lix
|
||
</span>
|
||
|
||
|
||
</a>
|
||
|
||
|
||
<label class="md-nav__link " for="__nav_4" id="__nav_4_label" tabindex="">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
</div>
|
||
|
||
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="true">
|
||
<label class="md-nav__title" for="__nav_4">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Lix
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../glossary/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Glossary
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../../quick-start/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Quick Start
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../Advanced-Topics/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Advanced Topics
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../Command-Reference/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Command Reference
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../Package-Management/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Package Management
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../architecture/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Architecture
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../contributing/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Contributing
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../installation/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Installation
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--active md-nav__item--nested">
|
||
|
||
|
||
|
||
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4_10" checked>
|
||
|
||
|
||
|
||
<div class="md-nav__link md-nav__container">
|
||
<a href="../" class="md-nav__link ">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Language
|
||
</span>
|
||
|
||
|
||
</a>
|
||
|
||
|
||
<label class="md-nav__link " for="__nav_4_10" id="__nav_4_10_label" tabindex="0">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
</div>
|
||
|
||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_10_label" aria-expanded="true">
|
||
<label class="md-nav__title" for="__nav_4_10">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Language
|
||
</label>
|
||
<ul class="md-nav__list" data-md-scrollfix>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../advanced-attributes/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Advanced Attributes
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../builtin-constants/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Built-in Constants
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../builtins/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Built-in Functions
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../constructs/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Language Constructs
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../derivations/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Derivations
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--active">
|
||
|
||
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
|
||
|
||
|
||
|
||
|
||
|
||
<label class="md-nav__link md-nav__link--active" for="__toc">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Operators
|
||
</span>
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
||
|
||
<a href="./" class="md-nav__link md-nav__link--active">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Operators
|
||
</span>
|
||
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<label class="md-nav__title" for="__toc">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Table of contents
|
||
</label>
|
||
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#attribute-selection" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Attribute selection
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#has-attribute" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Has attribute
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#arithmetic" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Arithmetic
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#string-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
String concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#path-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Path concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#path-and-string-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Path and string concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#string-and-path-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
String and path concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#update" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Update
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#comparison" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Comparison
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#equality" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Equality
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#logical-implication" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Logical implication
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../string-interpolation/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
String interpolation
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item">
|
||
<a href="../values/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Data Types
|
||
</span>
|
||
|
||
|
||
</a>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||
|
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|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../protocols/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Protocols
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../release-notes/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Release notes
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
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|
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|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../../NixOS/appstream/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
NixOS
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="md-nav__item md-nav__item--pruned md-nav__item--nested">
|
||
|
||
|
||
|
||
|
||
<a href="../../../Nixpkgs/" class="md-nav__link">
|
||
|
||
|
||
<span class="md-ellipsis">
|
||
Nixpkgs
|
||
</span>
|
||
|
||
|
||
|
||
<span class="md-nav__icon md-icon"></span>
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
</ul>
|
||
</nav>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
<div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
|
||
<div class="md-sidebar__scrollwrap">
|
||
<div class="md-sidebar__inner">
|
||
|
||
|
||
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<label class="md-nav__title" for="__toc">
|
||
<span class="md-nav__icon md-icon"></span>
|
||
Table of contents
|
||
</label>
|
||
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#attribute-selection" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Attribute selection
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#has-attribute" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Has attribute
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#arithmetic" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Arithmetic
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#string-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
String concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#path-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Path concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#path-and-string-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Path and string concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#string-and-path-concatenation" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
String and path concatenation
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#update" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Update
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#comparison" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Comparison
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#equality" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Equality
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
<li class="md-nav__item">
|
||
<a href="#logical-implication" class="md-nav__link">
|
||
<span class="md-ellipsis">
|
||
Logical implication
|
||
</span>
|
||
</a>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
|
||
</nav>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
<div class="md-content" data-md-component="content">
|
||
<article class="md-content__inner md-typeset">
|
||
|
||
|
||
|
||
|
||
<h1 id="operators">Operators</h1>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Name</th>
|
||
<th>Syntax</th>
|
||
<th>Associativity</th>
|
||
<th>Precedence</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><a href="#attribute-selection">Attribute selection</a></td>
|
||
<td><em>attrset</em> <code>.</code> <em>attrpath</em> [ <code>or</code> <em>expr</em> ]</td>
|
||
<td>none</td>
|
||
<td>1</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Function application</td>
|
||
<td><em>func</em> <em>expr</em></td>
|
||
<td>left</td>
|
||
<td>2</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#arithmetic">Arithmetic negation</a></td>
|
||
<td><code>-</code> <em>number</em></td>
|
||
<td>none</td>
|
||
<td>3</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#has-attribute">Has attribute</a></td>
|
||
<td><em>attrset</em> <code>?</code> <em>attrpath</em></td>
|
||
<td>none</td>
|
||
<td>4</td>
|
||
</tr>
|
||
<tr>
|
||
<td>List concatenation</td>
|
||
<td><em>list</em> <code>++</code> <em>list</em></td>
|
||
<td>right</td>
|
||
<td>5</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#arithmetic">Multiplication</a></td>
|
||
<td><em>number</em> <code>*</code> <em>number</em></td>
|
||
<td>left</td>
|
||
<td>6</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#arithmetic">Division</a></td>
|
||
<td><em>number</em> <code>/</code> <em>number</em></td>
|
||
<td>left</td>
|
||
<td>6</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#arithmetic">Subtraction</a></td>
|
||
<td><em>number</em> <code>-</code> <em>number</em></td>
|
||
<td>left</td>
|
||
<td>7</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#arithmetic">Addition</a></td>
|
||
<td><em>number</em> <code>+</code> <em>number</em></td>
|
||
<td>left</td>
|
||
<td>7</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#string-concatenation">String concatenation</a></td>
|
||
<td><em>string</em> <code>+</code> <em>string</em></td>
|
||
<td>left</td>
|
||
<td>7</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#path-concatenation">Path concatenation</a></td>
|
||
<td><em>path</em> <code>+</code> <em>path</em></td>
|
||
<td>left</td>
|
||
<td>7</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#path-and-string-concatenation">Path and string concatenation</a></td>
|
||
<td><em>path</em> <code>+</code> <em>string</em></td>
|
||
<td>left</td>
|
||
<td>7</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#string-and-path-concatenation">String and path concatenation</a></td>
|
||
<td><em>string</em> <code>+</code> <em>path</em></td>
|
||
<td>left</td>
|
||
<td>7</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Logical negation (<code>NOT</code>)</td>
|
||
<td><code>!</code> <em>bool</em></td>
|
||
<td>none</td>
|
||
<td>8</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#update">Update</a></td>
|
||
<td><em>attrset</em> <code>//</code> <em>attrset</em></td>
|
||
<td>right</td>
|
||
<td>9</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#comparison-operators">Less than</a></td>
|
||
<td><em>expr</em> <code><</code> <em>expr</em></td>
|
||
<td>none</td>
|
||
<td>10</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#comparison-operators">Less than or equal to</a></td>
|
||
<td><em>expr</em> <code><=</code> <em>expr</em></td>
|
||
<td>none</td>
|
||
<td>10</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#comparison-operators">Greater than</a></td>
|
||
<td><em>expr</em> <code>></code> <em>expr</em></td>
|
||
<td>none</td>
|
||
<td>10</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#comparison-operators">Greater than or equal to</a></td>
|
||
<td><em>expr</em> <code>>=</code> <em>expr</em></td>
|
||
<td>none</td>
|
||
<td>10</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#equality">Equality</a></td>
|
||
<td><em>expr</em> <code>==</code> <em>expr</em></td>
|
||
<td>none</td>
|
||
<td>11</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Inequality</td>
|
||
<td><em>expr</em> <code>!=</code> <em>expr</em></td>
|
||
<td>none</td>
|
||
<td>11</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Logical conjunction (<code>AND</code>)</td>
|
||
<td><em>bool</em> <code>&&</code> <em>bool</em></td>
|
||
<td>left</td>
|
||
<td>12</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Logical disjunction (<code>OR</code>)</td>
|
||
<td><em>bool</em> <code></td>
|
||
<td></td>
|
||
<td></code> <em>bool</em></td>
|
||
</tr>
|
||
<tr>
|
||
<td><a href="#logical-implication">Logical implication</a></td>
|
||
<td><em>bool</em> <code>-></code> <em>bool</em></td>
|
||
<td>none</td>
|
||
<td>14</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<h3 id="attribute-selection">Attribute selection</h3>
|
||
<blockquote>
|
||
<p><em>attrset</em> <code>.</code> <em>attrpath</em> [ <code>or</code> <em>expr</em> ]</p>
|
||
</blockquote>
|
||
<p>Select the attribute denoted by attribute path <em>attrpath</em> from <a href="../values/#attribute-set">attribute set</a> <em>attrset</em>.
|
||
If the attribute doesn’t exist, return the <em>expr</em> after <code>or</code> if provided, otherwise abort evaluation.</p>
|
||
<p>An attribute path is a dot-separated list of <a href="../values/#attribute-set">attribute names</a>.</p>
|
||
<blockquote>
|
||
<p><em>attrpath</em> = <em>name</em> [ <code>.</code> <em>name</em> ]...</p>
|
||
</blockquote>
|
||
<h3 id="has-attribute">Has attribute</h3>
|
||
<blockquote>
|
||
<p><em>attrset</em> <code>?</code> <em>attrpath</em></p>
|
||
</blockquote>
|
||
<p>Test whether <a href="../values/#attribute-set">attribute set</a> <em>attrset</em> contains the attribute denoted by <em>attrpath</em>.
|
||
The result is a <a href="../values/#type-boolean">Boolean</a> value.</p>
|
||
<h3 id="arithmetic">Arithmetic</h3>
|
||
<p>Numbers are type-compatible:
|
||
Pure integer operations will always return integers, whereas any operation involving at least one floating point number return a floating point number.</p>
|
||
<p>See also <a href="#comparison-operators">Comparison</a> and <a href="#equality">Equality</a>.</p>
|
||
<p>The <code>+</code> operator is overloaded to also work on strings and paths.</p>
|
||
<h3 id="string-concatenation">String concatenation</h3>
|
||
<blockquote>
|
||
<p><em>string</em> <code>+</code> <em>string</em></p>
|
||
</blockquote>
|
||
<p>Concatenate two <a href="../values/#type-string">string</a>s and merge their string contexts.</p>
|
||
<h3 id="path-concatenation">Path concatenation</h3>
|
||
<blockquote>
|
||
<p><em>path</em> <code>+</code> <em>path</em></p>
|
||
</blockquote>
|
||
<p>Concatenate two <a href="../values/#type-path">path</a>s.
|
||
The result is a path.</p>
|
||
<h3 id="path-and-string-concatenation">Path and string concatenation</h3>
|
||
<blockquote>
|
||
<p><em>path</em> + <em>string</em></p>
|
||
</blockquote>
|
||
<p>Concatenate <em><a href="../values/#type-path">path</a></em> with <em><a href="../values/#type-string">string</a></em>.
|
||
The result is a path.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>The string must not have a string context that refers to a <a href="../../glossary/#gloss-store-path">store path</a>.</p>
|
||
</div>
|
||
<h3 id="string-and-path-concatenation">String and path concatenation</h3>
|
||
<blockquote>
|
||
<p><em>string</em> + <em>path</em></p>
|
||
</blockquote>
|
||
<p>Concatenate <em><a href="../values/#type-string">string</a></em> with <em><a href="../values/#type-path">path</a></em>.
|
||
The result is a string.</p>
|
||
<blockquote>
|
||
<p><strong>Important</strong></p>
|
||
<p>The file or directory at <em>path</em> must exist and is copied to the <a href="../../glossary/#gloss-store">store</a>.
|
||
The path appears in the result as the corresponding <a href="../../glossary/#gloss-store-path">store path</a>.</p>
|
||
</blockquote>
|
||
<h3 id="update">Update</h3>
|
||
<blockquote>
|
||
<p><em>attrset1</em> // <em>attrset2</em></p>
|
||
</blockquote>
|
||
<p>Update <a href="../values/#attribute-set">attribute set</a> <em>attrset1</em> with names and values from <em>attrset2</em>.</p>
|
||
<p>The returned attribute set will have of all the attributes in <em>attrset1</em> and <em>attrset2</em>.
|
||
If an attribute name is present in both, the attribute value from the latter is taken.</p>
|
||
<h3 id="comparison">Comparison</h3>
|
||
<p>Comparison is</p>
|
||
<ul>
|
||
<li><a href="#arithmetic">arithmetic</a> for <a href="../values/#type-number">number</a>s</li>
|
||
<li>lexicographic for <a href="../values/#type-string">string</a>s and <a href="../values/#type-path">path</a>s</li>
|
||
<li>item-wise lexicographic for <a href="../values/#list">list</a>s:
|
||
elements at the same index in both lists are compared according to their type and skipped if they are equal.</li>
|
||
</ul>
|
||
<p>All comparison operators are implemented in terms of <code><</code>, and the following equivalencies hold:</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>comparison</th>
|
||
<th>implementation</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><em>a</em> <code><=</code> <em>b</em></td>
|
||
<td><code>! (</code> <em>b</em> <code><</code> <em>a</em> <code>)</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><em>a</em> <code>></code> <em>b</em></td>
|
||
<td><em>b</em> <code><</code> <em>a</em></td>
|
||
</tr>
|
||
<tr>
|
||
<td><em>a</em> <code>>=</code> <em>b</em></td>
|
||
<td><code>! (</code> <em>a</em> <code><</code> <em>b</em> <code>)</code></td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<h3 id="equality">Equality</h3>
|
||
<ul>
|
||
<li><a href="../values/#attribute-set">Attribute sets</a> and <a href="../values/#list">list</a>s are compared recursively, and therefore are fully evaluated.</li>
|
||
<li>Comparison of <a href="../constructs/#functions">function</a>s always returns <code>false</code>.</li>
|
||
<li>Numbers are type-compatible, see <a href="#arithmetic">arithmetic</a> operators.</li>
|
||
<li>Floating point numbers only differ up to a limited precision.</li>
|
||
</ul>
|
||
<h3 id="logical-implication">Logical implication</h3>
|
||
<p>Equivalent to <code>!</code><em>b1</em> <code>||</code> <em>b2</em>.</p>
|
||
|
||
|
||
|
||
|
||
|
||
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