medium-fp-errorhandling.ps1

$ErrorActionPreference = "Stop"

function Assert-True {
    [CmdletBinding()] # add ErrorAction support
    Param([boolean]$Value)
    if (-not $Value) {
        throw "Failed assertion"
    }
}

# imperative error handling
try {
    Assert-True $false
} catch {
    Write-Host "nothing to see here..."
}

# equivalent functional error handling with Nullable monad
if (-not (Assert-True $false -ErrorAction SilentlyContinue)) {
    Write-Host "nothing to see here..."
}