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Illustrating asynquence "Iterable Sequences"
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| function step(num) { | |
| return num * 2; | |
| } | |
| // set up an iterable sequence | |
| var isq = ASQ.iterable() | |
| .then(step) | |
| .then(step) | |
| .then(step); | |
| // synchronously iterate the sequence | |
| for (var seed = 3, ret; | |
| // call `next(..)` on the iterable sequence | |
| // to advance it one iteration | |
| (ret = isq.next(seed)) && !ret.done; | |
| ) { | |
| seed = ret.value; | |
| console.log(seed); | |
| } | |
| // 6 | |
| // 12 | |
| // 24 |
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| function step(num) { | |
| return num * 2; | |
| } | |
| function iterate(msg) { | |
| // call `next(..)` on the iterable sequence | |
| // to advance it one iteration | |
| var ret = isq.next(msg); | |
| if (!ret.done) { | |
| return ret.value; | |
| } | |
| else { | |
| // break the iteration loop | |
| throw "Iteration complete."; | |
| } | |
| } | |
| // set up an iterable sequence | |
| var isq = ASQ.iterable() | |
| .then(step) | |
| .then(step) | |
| .then(step) | |
| .then(function(){ | |
| throw "Should not get here!"; | |
| }) | |
| .or(function(msg){ | |
| console.log(msg); // Too big! | |
| }); | |
| // set up an async loop sequence controller | |
| loop = ASQ() | |
| .or(function(msg){ | |
| console.log(msg); // Iteration complete. | |
| console.log(seed); // 24 | |
| }); | |
| // asynchronously iterate the sequence | |
| (function next(msg){ | |
| if (msg > 15) { | |
| // throw an error into the iterable | |
| // sequence | |
| sq.throw("Too big!"); | |
| } | |
| // store seed so we can check it at the end | |
| seed = msg; | |
| loop | |
| // wait before proceeding with the iteration | |
| .then(function(done){ | |
| setTimeout(done,50); | |
| }) | |
| .val( | |
| // inject `msg` into the sequence's | |
| // message stream | |
| msg, | |
| // process the current iteration | |
| iterate, | |
| // start up the next loop iteration | |
| next | |
| ); | |
| })(3); // start out msg/step as `3` |
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