Dart 1.9 hints

[Adam Lofts]

I've upgraded to Dart 1.9 and am happy to see a list of new hints and warnings to fix in my codebase. Always great to have better static analysis.

I have a bit of code like this:

Iterable l;
List outer = [];

for (Object _ in l) {

  outer.add([]);

}

This code now gives a hint:

The value of the local variable '_' is not used

Is there some way to tell the analysis server that I don't expect _ to be used? I realize that I could re-factor this code to a functional style but I think it is clearest with the for - in style loop.

[Andreas Kirsch]

Maybe try: List outer = new List.filled(l.length, []);

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[Jos Hirth]

On Saturday, March 28, 2015 at 1:42:11 PM UTC+1, Andreas Kirsch wrote:

Maybe try: List outer = new List.filled(l.length, []);

That would create a list filled with references to one particular list. The `List.generate` constructor does what you want.

[Daniel Rubel]

It is a very common idiom to use '_' as a var name when a var name is required but ignored.

I think we need to enhance/fix the analyzer.

https://code.google.com/p/dart/issues/detail?id=23050

 

[Filipe Morgado]

+1