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a.js
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function _new (fn, ...args) {
const o = Object.create(fn.prototype)
fn.apply(o, args)
if (Object.prototype.toString.call(o) === '[object Object]') {
return o
} else {
return {}
}
}
function sleep (duration) {
return new Promise(resolve => setTimeout(resolve, duration))
}
class AI {
tasks = []
flushing = false
sleep (duration) {
this.tasks.push(async () => {
console.log('sleeping')
await sleep(duration)
console.log('sleeped')
})
this.flush()
return this
}
task () {
this.tasks.push(async () => {
console.log('task')
})
this.flush()
return this
}
cancel () {
const t = this.tasks.pop()
this.tasks.push(async () => {
console.log(t ? 'cancel' : 'notask')
})
this.flush()
return this
}
async flush () {
if (this.flushing) return
this.flushing = true
console.log('flushing')
await sleep(0)
await runtask(this.tasks)
this.flushing = false
console.log('flushed')
}
}
async function runtask (tasks) {
if (tasks.length) {
const task = tasks.shift()
await task()
await runtask(tasks)
}
}