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Sequential promise resolve
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var f1 = () => { | |
return new Promise((resolve, reject) =>{ | |
setTimeout(()=>{ | |
resolve('p1 complete'); | |
}, 1000); | |
}); | |
}; | |
var f2 = () => { | |
return new Promise((resolve, reject) =>{ | |
setTimeout(()=>{ | |
resolve('p2 complete'); | |
}, 1000); | |
}); | |
}; | |
[f1, f2].reduce((x, y)=>{ | |
console.log(x,y); | |
return x.then(data => { | |
console.log(data); | |
return y(); | |
}); | |
}, Promise.resolve()).then(last => { | |
console.log(last); | |
}); | |
var p1 = new Promise((resolve, reject) => { | |
setTimeout(() => { | |
console.log('p1'); | |
resolve(); | |
}, 1000); | |
}); | |
var p2 = new Promise((resolve, reject) => { | |
setTimeout(() => { | |
console.log('p2'); | |
resolve('a'); | |
}, 2000); | |
}); | |
[p1,p2].reduce((x, y)=>{ | |
return x.then(()=>{ | |
return y; | |
}); | |
}, Promise.resolve()) | |
.then(()=>{ | |
console.log('finished all'); | |
}); |
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//https://remysharp.com/2015/12/18/promise-waterfall | |
var guid = 0; | |
function run() { | |
guid++; | |
var id = guid; | |
return new Promise(resolve => { | |
// resolve in a random amount of time | |
setTimeout(function () { | |
console.log(id); | |
resolve(id); | |
}, (Math.random() * 1.5 | 0) * 1000); | |
}); | |
} | |
var promises = Array.from({ length: 10 }).reduce(function (acc) { | |
return acc.then(function (res) { | |
return run().then(function (result) { | |
res.push(result); | |
return res; | |
}); | |
}); | |
}, Promise.resolve([])); | |
promises.then(console.log); |
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