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https://issues.apache.org/jira/browse/TINKERPOP-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stephen mallette updated TINKERPOP-2167:
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Labels: (was: pull-request-available)
> Gremlin Javascript Traversal as async iterable
> ----------------------------------------------
>
> Key: TINKERPOP-2167
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2167
> Project: TinkerPop
> Issue Type: Improvement
> Components: javascript
> Affects Versions: 3.4.0
> Environment: Node v10.15.0
> Reporter: Joe Strouth
> Priority: Minor
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Traversals in Gremlin javascript are async iterators, as they implement a
> {{next()}} method that returns a Promise, which resolves to an object with
> {{value}} and {{done}} properties. It would be helpful if they were also
> async iterables - traversable via {{for await ... of}} loops.
> {code:javascript}
> (async function() {
> for await (const continent of g.V().hasLabel('continent').values('desc')) {
> console.log(continent)
> }
> })()
> {code}
> Expected output:
> {noformat}
> > Africa
> Antarctica
> North America
> Asia
> Oceania
> Europe
> South America
> {noformat}
> Current output: (Node v10.15.0)
> {noformat}
> > (node:14698) UnhandledPromiseRejectionWarning: TypeError:
> > g.V(...).hasLabel(...).values(...) is not a function or its return value is
> > not async iterable
> at repl:1:78
> at repl:1:122
> at Script.runInThisContext (vm.js:96:20)
> at REPLServer.defaultEval (repl.js:332:29)
> at bound (domain.js:395:14)
> at REPLServer.runBound [as eval] (domain.js:408:12)
> at REPLServer.onLine (repl.js:639:10)
> at REPLServer.emit (events.js:187:15)
> at REPLServer.EventEmitter.emit (domain.js:441:20)
> at REPLServer.Interface._onLine (readline.js:290:10)
> (node:14698) UnhandledPromiseRejectionWarning: Unhandled promise rejection.
> This error originated either by throwing inside of an async function without
> a catch block, or by rejecting a promise which was not handled with .catch().
> (rejection id: 1)
> (node:14698) [DEP0018] DeprecationWarning: Unhandled promise rejections are
> deprecated. In the future, promise rejections that are not handled will
> terminate the Node.js process with a non-zero exit code.
> {noformat}
> This can be achieved by adding {{[Symbol.asyncIterator]}} to the Traversal
> class.
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