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Await and yield
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| // Let `doAjax`, `fadeIn`, `fadeOut`, and `delay` be promise-returning functions. | |
| // In all the following examples, `example` is meant to return a promise that is fulfilled when | |
| // all operations are completed, or rejected if any of the steps fail. | |
| // ES5 | |
| function example() { | |
| return doAjax("data.json").then(function (data) { | |
| document.getElementById("data").innerText = data; | |
| var status = document.getElementById("status"); | |
| return fadeIn(status).then(function () { | |
| return delay(2000); | |
| }).then(function () { | |
| return fadeOut(status); | |
| }); | |
| }); | |
| } | |
| // ES6 | |
| const example = Q.async(function* () { | |
| document.getElementById("data").innerText = yield doAjax("data.json"); | |
| const status = document.getElementById("status"); | |
| yield fadeIn(status); | |
| yield delay(2000); | |
| return fadeOut(status); // not sure this is right? maybe just `yield fadeOut(status); return;`? | |
| }); | |
| // ES-some-time-after-6 | |
| function^ example() { | |
| document.getElementById("data").innerText = await doAjax("data.json"); | |
| const status = document.getElementById("status"); | |
| await fadeIn(status); | |
| await delay(2000); | |
| await fadeOut(status); | |
| } |
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