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ES6 Generators with Promises
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(function(target) { | |
let run = generator => { | |
let sequence; | |
let process = result => { | |
if(result.done) { return; } | |
result.value | |
.then(value => { | |
process(sequence.next(value)); | |
}) | |
.catch(err => { | |
process(sequence.throw(err)); | |
}); | |
}; | |
sequence = generator(); | |
process(sequence.next()); | |
}; | |
target.async = { | |
run | |
}; | |
}(window)); | |
function* main() { | |
try { | |
let price = yield getStockPrice(); | |
if(price > 45) { | |
yield executeTrade(); | |
} | |
} | |
catch(ex) { | |
console.error('failed', ex); | |
} | |
} | |
function getStockPrice() { | |
return new Promise((resolve, reject) => { | |
setTimeout(() => { | |
//reject(); | |
console.log('got price'); | |
resolve(50); | |
}, 100); | |
}); | |
} | |
function executeTrade() { | |
return new Promise((resolve, reject) => { | |
setTimeout(() => { | |
console.log('executed trade'); | |
resolve(); | |
}, 100); | |
}); | |
} | |
async.run(main); |
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