misssing .some() on QueryList

[Frozen-byte]

I'm submitting a ... (check one with "x")

[ ] bug report
[X] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
QueryList does not support the .some() method, but forEach()

Expected/desired behavior
QueryList should be able to call some()

What is the motivation / use case for changing the behavior?
.some() is a nicer way to iterate Lists quickly if you only need one Element

Please tell us about your environment:

• Angular version: 2.0.0-rc.2
• Browser: [all]
• Language: [TypeScript 1.8.10]

[vicb]

That should be quite easy to implement, do you want to try sending a PR ?

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