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To validate a result returned by a function in PowerShell by checking a condition, you can use an if statement. Here's an example:

$result = myFunction(param1, param2)

if ($result -eq "expectedValue") {
    Write-Host "Validation passed"
} else {
    Write-Host "Validation failed"
}

In this example, the result of the function call is stored in the $result variable. The if statement checks if the value of $result is equal to the expected value, "expectedValue". If it is, the message "Validation passed" is written to the console. If not, the message "Validation failed" is written instead. You can replace "expectedValue" with any condition that you want to check.