Powershell pitfalls

Question

What Powershell pitfalls you have fall into? :-)

Mine are:

# -----------------------------------
function foo()
{
    @(\"text\")
}

# Expected 1, a         


        

Answer 1

The logical and bitwise operators don't follow standard precedence rules. The operator -and should have a higher priority than -or yet they're evaluated strictly left-to-right.

For example, compare logical operators between PowerShell and Python (or virtually any other modern language):

# PowerShell
PS> $true -or $false -and $false
False

# Python
>>> True or False and False
True

...and bitwise operators:

# PowerShell
PS> 1 -bor 0 -band 0
0

# Python
>>> 1 | 0 & 0
1