Understanding Variable Inheritance

by Oct 14, 2010

PowerShell variables are inherited downstream by default, not upstream. So any variable you create at a given scope is passed to any code you call from there:

$a = 1
Function test {
"variable a contains $a"
$a = 2
"variable a contains $a"
variable a contains 1
variable a contains 2

This is why the function test receives variable $a from its parent scope. While it can define its own variable $a as well, it never affects the parent variable $a because it is only inherited downstream.

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