built-in method

Leap
Leap in PowerShell 
function Test-Leap([int] $year) {
    [DateTime]::IsLeapYear($year)
}

Utilizing the DateTime class from .NET, you can determine if a year is a leap year or not by passing it into the IsLeapYear static method. This might not be the intended approach for learning, but it is an idiomatic way to check if a year is leap or not.

IsLeapYear method.

21st Aug 2024 · Found it useful?

Other Approaches to Leap in PowerShell

Other ways our community solved this exercise
function Test-Leap([int] $year) {
    $year % 4 -eq 0 -and $year % 100 -ne 0 -or $year % 400 -eq 0
}
Boolean chain

Use a chain of boolean expressions. 

function Test-Leap([int] $year) {
    (Get-Time -Year $year -Month 2 -Day 29).Month -eq 2
}
datetime object

Use datetime object and its property.