Semantic of invoking PowerShell functions and object methods is different.
Functions
- Parentheses should not be used.
- Parameters are space separated.
- Parameters are positional or named.
- There are no overloaded functions.
Methods
- Parentheses must be used.
- Parameters are comma separated.
- Parameters are positional.
- There may be overloaded methods.
It is unlikely possible to invoke an object method using function syntax by mistake, PowerShell will not recognise this as a valid call.
But it is possible to invoke a function using method syntax or just use comma by mistake for separating parameters. In such cases a function may even work without errors. But parameter may be not correct, i.e. not as designed.
Set-StrictMode -Version 2 may help to catch some of such mistakes.
Scripts
- various.function.calls.ps1 shows various function calls with potential mistakes.
- various.function.calls.strict.ps1 - some mistakes can be caught in the strict mode.