> For the complete documentation index, see [llms.txt](https://docs.expression-library.bearstudios.co.uk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.expression-library.bearstudios.co.uk/adding-custom-controls/example-expression.md).

# Example Expressions

There are technically three different types of expressions you can save.

## Standard Expression

Standard expressions use no [**custom functions**](/adding-custom-controls/custom-functions.md). They are what we describe as just an expression. These need no unquie set-up and can be saved straight from the property without any problems

{% content-ref url="/pages/-Lq1iQd7Ts9xXUoJb2vy" %}
[Standard Expression](/adding-custom-controls/example-expression/standard-expression.md)
{% endcontent-ref %}

## Expression With thisLayer

Expressions that use the keyword [**thisLayer**](/adding-custom-controls/thislayer-and-master-layers.md#what-is-thislayer) and connect to an effect need no adjustments inside the expression itself. But, do need [**functions**](/adding-custom-controls/custom-functions.md) to be set-up correctly.

{% content-ref url="/pages/-Lq1iUbeXNKmTLWOZ-wK" %}
[Expression with thisLayer Controls](/adding-custom-controls/example-expression/expression-with-thislayer-controls.md)
{% endcontent-ref %}

## Expression With Master

Using expressions with a master layer need some initial set-up and code to be able to run correctly. The most important part is that `var master = thisComp.layer("master layer name");` needs to be added below the [**custom functions**](/interface-overview/expression-functions.md)

{% content-ref url="/pages/-Lq1iY655SOX-ziux-zq" %}
[Expression With Master Controls](/adding-custom-controls/example-expression/expression-with-master-controls.md)
{% endcontent-ref %}