array-asyncify

NOTE Not work under node 8.x

Issue

We cannot use async function graceful in array methods such as filter,map,reduce and so on.

So the following code do not work

let a=[1,2,3]
a.map(async (e)=>{
  //some async operations
  //await ...
  return e+1
})
.filter(async (e)=>{
  //some async operations
  return e%2===0
})

Resolution

const { asyncify } = require("array-asyncify")
let delay = (t) => new Promise(res => setTimeout(res), t)
console.log("Example:");
(async () => {

  let a = asyncify([1, 2, 3])
  console.log("ret:")
  let ret = await a
    .map(async (e) => {
      await delay(100);
      return e + 1
    })
    .map(async (e) => {
      await delay(100)
      return e * 2
    })
  console.log(ret)

  try {
    let b = asyncify([1, Promise.resolve(2), 3])
    console.log("sum:", await b.reduce(async (p, n) => {
      console.log("p,n", p, n)
      return p + n
    }))
  } catch (e) {
    console.log(e)
  }


})()

TODO

asyncify other method.