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bayleedev/loop-promise.js

Last active February 23, 2017 18:17
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Raw
loop-promise.js
const urls = [
'https://google.com',
'http://blainesch.com',
'https://github.com',
]
let follower = Promise.resolve()
for (let currentUrl of urls) {
follower = follower.then(() => {
return new Promise((resolve) => {
console.log('processing', currentUrl)
setTimeout(resolve, 1000)
})
})
}
Raw
recursive-promise.js
const urls = [
'https://google.com',
'http://blainesch.com',
'https://github.com',
]
const process = (urls) => {
const currentUrl = urls.shift()
return new Promise((resolve) => {
console.log('processing', currentUrl)
setTimeout(resolve, 1000)
}).then(() => {
if (urls.length > 0) {
return process(urls)
}
})
}
process(urls.slice(0)).then(() => {
console.log('done')
})
@afaur
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afaur commented Jan 28, 2017 

let foo = Promise.resolve()

const urls = [
  'https://google.com',
  'http://blainesch.com',
  'https://github.com',
]

let timeout = (time) => {
  return new Promise((resolve) => {
    setTimeout(resolve, time)
  })
}

for (let url of urls) {
  foo = foo.then(() => {
    console.log(url)
    return timeout(1000)
  })
}

Abstracted timeout to a function.

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