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The snippet library.
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Expose observation without exposing resolution
jQuery: promise returns an interface without resolve or reject methods.
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Inspect a deferred’s lifecycle state
jQuery: state reports pending, resolved, or rejected.
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Observe completion of queued work
jQuery: The queue promise resolves when the selected elements’ queue is empty.
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Reject a deferred result
jQuery: fail receives the reason supplied to reject.
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Report progress before completion
jQuery: notify calls registered progress handlers while the deferred is pending.
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Resolve a deferred result
jQuery: done receives the value supplied to resolve.
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Sequence work on an element’s queue
jQuery: A queue callback calls next to allow the following callback to run.
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Start a named queue explicitly
jQuery: Named queues wait until dequeue starts them.
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Transform a deferred value with then
jQuery: then returns a new promise with the callback’s result.
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Wait for several deferred values
jQuery: when resolves only after every supplied deferred has resolved.
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