why i don't like yield? await a + await b to mean (await a) + (await b), but yield a + yield b means yield (a + (yield b))

yield-vs-await.js

'use strict'

function sum(a, b) {
  return a+b
}

function mul(a, b) {
  return a*b
}

async function asyncTest(a,b) {
  //return await sum (a,b) + (await mul (a,b)) // fine, no error
  return await sum (a,b) + await mul (a,b) // no error
}

function *yieldTest(a,b){
  let result
  // return result = yield sum (a,b) + yield mul (a,b) // error
  // return result = yield sum (a,b) + (yield mul (a,b)) // no error, but fucked-up
  yield result = sum (a,b)
  yield result = result + mul (a,b) 
  return result // no error
}


asyncTest(2,3).then((res) => console.log('asyncTest: '+res)) // asyncTest: 11

const g = yieldTest(2,3)

console.log(g.next()) // { value: 5, done: false }
console.log(g.next()) // { value: 11, done: false }
console.log(g.next()) // { value: 11, done: true }
console.log(g.next()) // { value: undefined, done: true }



// * always return a generator that can be advanced (and stopped) 
// from outside by consuming it similar to an iterator

// async will always return a promise that depends 
// on other promises and whose execution is concurrent 
// to other asynchronous operations 
// (and might be cancelled from outside).