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In PowerShell, how do I define a function in a fichier and call it from the PowerShell commandeline?

ayi

I have a .ps1 file in which I want to define custom functions.
Imagine the file is called MyFunctions.ps1, and the content is as follows:
<pre><code class="lang-auto">Write-Host "Installing functions"
function A1
{
Write-Host "A1 is running!"
}
Write-Host "Done"

</code></pre>
To run this script and theoretically register the A1 function, I navigate to the folder in which the .ps1 file resides and run the file:
<pre><code class="lang-auto">.\MyFunctions.ps1

</code></pre>
This outputs:
<pre><code class="lang-auto">Installing functions
Done

</code></pre>
Yet, when I try to call A1, I simply get the error stating that there is no command/function by that name:
<pre><code class="lang-auto">The term 'A1' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling
of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:3

A1 <<<<
- CategoryInfo : ObjectNotFound: (A1:String) [], CommandNotFoundException
- FullyQualifiedErrorId : CommandNotFoundException

</code></pre>
I must misunderstand some PowerShell concepts. Can I not define functions in script files?
Note that I have already set my execution policy to ‘RemoteSigned’. And I know to run .ps1 files using a dot in front of the file name: .\myFile.ps1

ayi_2

Try this on the PowerShell command line:
<pre><code class="lang-auto">. .\MyFunctions.ps1
A1

</code></pre>
The dot operator is used for script include, aka "dot-sourcing" (or <a href="https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_scopes?view=powershell-5.1#using-dot-source-notation-with-scope">"dot source notation"</a>)