It would be nice if this did not consume all memory

promise-garbage-collection.js

var BPromise = require('bluebird')

var i = 0, n = 100000000;
function mapManyThings() {
  return BPromise.map(new Array(1000), function () {
    return BPromise.delay(1).then(function () {
      i++
      var aThousandFloats = new Array(1000).map(function () {
        return Math.random()
      })
      return aThousandFloats
    })
  }).then(function (thisShouldBeGCd) {
    process.stdout.write('\rshould garbage collect: ' + thisShouldBeGCd.length + ' random floats. Processed ' + i + ' batches of random floats')
  })
}

function mapWithoutReferences() {
  mapManyThings().then(function () {
    if (i < n) {
      process.nextTick(mapWithoutReferences)
    }
  })
}

mapWithoutReferences()