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when timeout

Trevor Senior edited this page Dec 3, 2013 · 3 revisions

The when/timeout helper creates a promise that automatically rejects after a specified time, if not resolved before that. This allows you to setup up scenarios where a computation must finish within a certain time, or be rejected.

var timeout = require('when/timeout');

function doSomething() {

    // Kickoff a slow, asynchronous calculation
    var slowCalculationPromise = when(doSlowAsyncCalculation());

    // Return a new promise that will resolve if doSlowAsyncCalculation finishes
    // in under 5 seconds, but will reject if it doesn't.
    // The resolution value will be the result of doSlowAsyncCalculation
    return timeout(5000, slowCalculationPromise);
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