New Rule Suggestion / Rule amendment - in response to #903

[kilasuit]

In Issue #903 the rule in my opinion correctly throws on a += for simple defined arrays using the $var = @() method of defining an array to the var variable

I would suggest that a new rule is created that correctly identifies this method as being an expensive action and that a recommendation to use a fully defined Array collection would be a better suggestion, initially suggesting using a System.Collections.ArrayList

This rule should look for both @() & += and suggest converting these calls better scripting practices

[essentialexch]

#903 doesn't use an array.

[bergmeister]

I agree that we need a rule to catch the += on arrays due to the performance implications but I also agree that this issue is not really linked to the referenced issue. They are 2 separate issues to me.

[bergmeister]

Going through some past issues reveals that this seems to be a duplicate of #806. I will close this issue in the next days then but plan to do a PoC of implementing such a rule in the next 1-2 months.