Conditionals

Powershell doesn't have an 'else if' keyword, must nest if statements inside else blocks:

Clear-Host
$var = 2
if ($var -eq 1)
{
    Clear-Host
    "If branch"
}
else
{
    Clear-Host
    "Else branch"
    if ($var -eq 2)
    {
        "If -eq 2 branch"
    }
    else
    {
        "Else else branch"
    }
}

Switch-case:

Clear-Host
$var = 42
switch ($var)
{
    41 {"Forty One"}
    42 {"Forty Two"}
    43 {"Forty Three"}
    default {"Something else"}
}

Will match all lines that are -eq:

# Outputs 'Forty Two' and 'Forty Two String'
Clear-Host
$var = 42
switch ($var)
{
    42 {"Forty Two"}
    "42" {"Forty Two String"}
    default {"Something else"}
}

To avoid matching multiple cases, use break:

# Outputs only 'Forty Two'
Clear-Host
$var = 42
switch ($var)
{
    42 {"Forty Two"; break}
    "42" {"Forty Two String"}
    default {"Something else"}
}

Switch also works with collections:

# Matches each case one at a time
Clear-Host
switch (3, 1, 2, 42)
{
    1 {"One"}
    2 {"Two"}
    3 {"Three"}
    default {"Something else"}
}

Switch is case insensitive by default, use -casesensitive to change this:

# Will only output 'mixedcase', without -casesensitive would match all 3 cases
Clear-Host
switch -casesensitive ("Pluralsight")
{
    "pluralsight" {"lowercase"}
    "PLURALSIGHT" {"uppercase"}
    "Pluralsight" {"mixedcase"}
}

Also supports wildcards using the -Wildcard switch:

# Matches all 3 cases
Clear-Host
switch -Wildcard ("Pluralsight")
{
    "plural*" {"*"}
    "?luralsight" {"?"}
    "Pluralsi???" {"???"}
}