/How to call a function in another PowerShell script

Question

Hi All,
I want to use dot-sourced method to call the function from other script,While calling Function.ps1 from the second script there is a Null value in the beginning,
How can we ignore this null value or there is a better approach of doing it without using Import-Module.
#=======Function.ps1============
function add($x,$y)
$z=$x+$y
Write-Host "The value is $Z"
add $a $b
#===========End==================
The second script which has been dot-source to call the function
#================Main script==========
. C:\Users\Anirban\Desktop\Tester.ps1 |Out-Null
add 1 2
#================================
Regards,
Anirban Singha

Answer 1

Dot Sourcing is adding the function ADD to console environment and the script is acting like a module vs a script with parameters.
The Add $a $b line should be removed. (Where are $a and $b defined?)
They are not defined hence, "The Value is " blank line
#=======Function.ps1============
function add($x,$y)
$z=$x+$y
Write-Host "The value is $Z"
add $a $b
Should be
#=======Function.ps1============
function add($x,$y)
$z=$x+$y
Write-Host "The value is $Z"
PS C:\Test> . c:\tester.ps1
Add 1 2
Add 3 4
The value is 3
The value is 7
However the add can work without dot sourcing the script file by parameterizing the script
#=======Function.ps1============
Param ($a,$b) # Parameters to the script
function add($x,$y)
$z=$x+$y
Write-Host "The value is $Z"
Add $a $b # body of script
PS C:\Test> 
C:\Tester.ps1 1 2
C:\Tester.ps1 3 4
The value is 3
The value is 7