serial-await-calls.js

async function add(x:number,y:number):Promise<number>{
  return x + y
}

const a = [1,2,3,4,5]

function PARALLEL(){
  return Promise.all(a.map((v) => add(v,1)))
}


function SERIAL(){
  return a
    .map((x) => () => add(x, 1))
    .reduce((acc, pf) =>
      acc.then( ar =>
        pf().then( v => ar.concat([v]) )
      )
    , Promise.resolve(Promise.resolve([])))
}


SERIAL().then((answer)=>console.log(`SERIAL ${answer.toString()}`))
PARALLEL().then((answer)=>console.log(`PARALLEL ${answer.toString()}`))