sass-site/source/documentation/values/null.md

title	introduction
null	The value `null` is the only value of its type. It represents the absence of a value, and is often returned by [functions](/documentation/at-rules/function) to indicate the lack of a result.

{% codeExample 'null', false %} @use "sass:map"; @use "sass:string";

@debug string.index("Helvetica Neue", "Roboto"); // null @debug map.get(("large": 20px), "small"); // null @debug &; // null

@use "sass:map" @use "sass:string"

@debug string.index("Helvetica Neue", "Roboto") // null @debug map.get(("large": 20px), "small") // null @debug & // null {% endcodeExample %}

If a list contains a null, that null is omitted from the generated CSS.

{% codeExample 'null-lists' %} $fonts: ("serif": "Helvetica Neue", "monospace": "Consolas");

h3 { font: 18px bold map-get($fonts, "sans"); }

$fonts: ("serif": "Helvetica Neue", "monospace": "Consolas")

h3 font: 18px bold map-get($fonts, "sans") {% endcodeExample %}

If a property value is null, that property is omitted entirely.

{% codeExample 'null-value-omitted' %} $fonts: ("serif": "Helvetica Neue", "monospace": "Consolas");

h3 { font: { size: 18px; weight: bold; family: map-get($fonts, "sans"); } }

$fonts: ("serif": "Helvetica Neue", "monospace": "Consolas")

h3 font: size: 18px weight: bold family: map-get($fonts, "sans") {% endcodeExample %}

null is also falsey, which means it counts as false for any rules or operators that take booleans. This makes it easy to use values that can be null as conditions for @if and if().

{% render 'code_snippets/example-if-parent-selector' %}