1.6. Booleans

Boolean (true or false) variables are most commonly initialized to their literal values of $true and $false. When it evaluates them as part of a Boolean expression (i.e., an “if” statement,) though, PowerShell maps results into a suitable Boolean representation.

Windows PowerShell Boolean interpretations
Result	Boolean representation
$true	True
$false	False
$null	False
Nonzero number	True
Zero	False
Nonempty string	True
Empty string	False
Nonempty array	True
Empty array	False
Hashtable (either empty or not)	True