most used with mfjs for do notation

mostmf.js

import {from,of,fromPromise,Stream} from 'most'
const M = require('@mfjs/core')
import CC from '@mfjs/cc'

M.profile('regenerator')
const MM = CC.makeMonad(Stream.prototype.chain,of)

let cnt = 0

function updateDb() {
  return new Promise(resolve => {
    setTimeout(
      () => {
        console.log(`DB UPDATED ${cnt}`)
        resolve(cnt++)
      }, 0)
  })
}

MM.run(function* () {
  const m = yield fromPromise(updateDb())
  const x = yield from([1,2])
  return `${x} ${m}`
}).observe(function(res) {
  console.log(res)
})
/*
outputs:
```
DB UPDATED 0
1 0
2 0
```
*/

let i = 0;
MM.run(function*() {
  const x = yield from([1,2])
  if (i++) {
    const y = yield from(['in then'])
    return `then ${x} ${y}` 
  } else {
    const y = yield from(['in else'])
    return `else ${x} ${y}` 
  }
}).observe(function(res) {
  console.log(res)
})

/*
outputs:
```
else 1 in else
then 2 in then
```
*/