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As per discussion in #2884, Observable.from(iterable) is preferred to emit onCompleted when iterable is empty even when nothing has been requested.

This PR adds a check on iterator.hasNext before the Producer is assigned and emits onCompleted immediately if hasNext returns false.

Includes unit test that failed on existing code base.

@davidmoten davidmoten changed the title Observable.from(empty) should emit onComplete even when 0 requested Observable.from(empty) to emit onComplete even when 0 requested Apr 21, 2015
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ah erk I need to rebase

@davidmoten davidmoten force-pushed the from-iter-eager-complete branch from d80d17b to 1f5ed40 Compare April 21, 2015 01:42
@davidmoten davidmoten force-pushed the from-iter-eager-complete branch from 1f5ed40 to 1c29e7c Compare April 21, 2015 05:16
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rebased now

@akarnokd
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Thanks!

akarnokd added a commit that referenced this pull request Apr 21, 2015
Observable.from(empty) to emit onComplete even when 0 requested
@akarnokd akarnokd merged commit 5044a0b into ReactiveX:1.x Apr 21, 2015
@davidmoten davidmoten deleted the from-iter-eager-complete branch April 21, 2015 08:04
@benjchristensen benjchristensen mentioned this pull request Apr 30, 2015
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2 participants