Jumping to another section in a PowerShell script - powershell

Question

I want to jump from one section in the script to another section in the same PowerShell script. My script is only going from top to bottom right now, but I have several tasks. e.g. I want to be able to choose from a task list in the beginning of the script and go to task number 2 skip task 1.
I hope this makes any sense for you. Take a look at my script:
Write-Host -ForegroundColor Yellow "welcome to my powershell script..."
""
""
""
Start-Sleep -Seconds 1
Write-Host -ForegroundColor Yellow "Choose a task:"
""
""
Write-Host -ForegroundColor Yellow "1. Clean up"
Write-Host -ForegroundColor Yellow "2. Uninstall Pre-Installed Apps"
Write-Host -ForegroundColor Yellow "3. Something should be written here"
""
""
""
While ($Valg -ne "1" -or $Valg -ne "2" -or $Valg -ne "3") {
$Valg = Read-Host "Choose a number from the task list"
If ($Valg –eq "1") { Break }
If ($Valg –eq "2") { Break }
If ($Valg –eq "3") { Break }
if ($Valg -ne "1" -or $Valg -ne "2" -or $Valg -ne "3") {
""
Write-Host -ForegroundColor Red "Ups. Try again..."
}
}
#### 1. First task should come here (clean up)
#some code here for the "cleaning up" task
#### 2. Second task here
#some code here for the "Uninstall Pre-Installed Apps" task
#### 3. Third task there
#Some code for the third task here
#### And so on...

Answer 1

Here is a generic solution which uses an array of PSCustomObject that represents the task (message and the function to invoke). It doesn't need a switch, you can simply add new Tasks to the array (and implement the desired function) without modifying the remaining script:
# define a task list with the messages to display and the functions to invoke:
$taskList = #(
[PSCustomObject]#{Message = 'Clean up'; Task = { Cleanup }}
[PSCustomObject]#{Message = 'Uninstall Pre-Installed Apps'; Task = { Uninstall }}
[PSCustomObject]#{Message = 'Something should be written here'; Task = { Print }}
)
# define the functions:
function Cleanup()
{
Write-Host "Cleanup"
}
function Uninstall()
{
Write-Host "Uninstall"
}
function Print()
{
Write-Host "Print"
}
# let the user pick a task:
Write-Host -ForegroundColor Yellow "Choose a task:"
$taskList | foreach -Begin { $i = 1;} -Process {
Write-Host -ForegroundColor Yellow ('{0}. {1}' -f ($i++), $_.Message)
}
do
{
$value = Read-Host 'Choose a number from the task list'
}
while($value -match '\D+' -or $value -le 0 -or $value -gt $taskList.Count)
# invoke the task:
& $taskList[$value-1].Task

Answer 2

I am updating answer to complete script based on inputs by "bluuf" and "majkinator".
Use the Switch-Case construct along with Functions like below. This is complete working solution.
#region Function Definitions. These come first before calling them
function FirstTask
(
[string] $inputVariable
)
{
"write any scipt for First task here without quotes. Input is: " + $inputVariable
}
function SecondTask
{
"write any scipt for Second task here without quotes"
}
function ThirdTask
{
"write any scipt for Third task here without quotes"
}
#endregion
#region Showing Options
Write-Host -ForegroundColor Yellow "welcome to my powershell script..."
""
""
""
Start-Sleep -Seconds 1
Write-Host -ForegroundColor Yellow "Choose a task:"
""
""
Write-Host -ForegroundColor Yellow "1. Clean up"
Write-Host -ForegroundColor Yellow "2. Uninstall Pre-Installed Apps"
Write-Host -ForegroundColor Yellow "3. Something should be written here"
Write-Host -ForegroundColor Yellow "0. Exit"
""
""
""
#endregion
#region Getting input
While ($true) {
$Valg = Read-Host "Choose a number from the task list"
If ($Valg –eq "0")
{
"Thanks for using my utility";
Break;
}
If (($Valg -ne "1") -and ($Valg -ne "2") -and ($Valg -ne "3") -and ($Valg -ne "0")) {
""
Write-Host -ForegroundColor Red "Ups. Try again..."
}
#region Main Code
switch ($Valg)
{
1{
FirstTask("sending input");
}
2 {
SecondTask;
}
3 {
ThirdTask;
}
default { "Please select a correct option."}
}
#endregion
}
#endregion