chunkListAsync.js

class Process {
  chunk(leads, count) {
    const X = count;
    return leads.reduce((ar, it, i) => {
      const ix = Math.floor(i / X);

      if (!ar[ix]) ar[ix] = [];

      ar[ix].push(it);

      return ar;
    }, [])
  }
  makeU(index, arrays) {
    let promises = arrays[index].map(items => {
      console.log('processed', items)
      return new Promise((resolve) => resolve(items))
    })
    return Promise.all(promises)
  }
  stackUpdate(leads) {
    const that = this
    const chunkCount = 1

    let arrays = this.chunk(leads, chunkCount)

    let totalCount = arrays.length

    console.log('>>> chunk', chunkCount, '')
    console.log('>>> totalCount', totalCount, '\n')
    let indexI = totalCount - 1
    if (indexI == 0) return that.makeU(indexI, arrays)


    let total = indexI
    let promises = []
    console.log('arrays', arrays, '\n')
    let executados = []

    const run = arrays.length
    for (let i = 0; i < run; i++) {
      let promise1 = that.makeU(i, arrays)
      promises.push(promise1)
    }

    let strings = []
    for (let i = 0; i < run; i++) {
      const promises1 = `promises[${i}].then(_ => promises[${i + 1})`
      strings.push(promises1)
      i += 1
    }

    eval(strings)
  }


}
new Process().stackUpdate(['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'])