Run results for: Ramda vs. naive with equality checker

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; Mi A2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36

Browser: Chrome Mobile 81

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Ramda	352442.6 Ops/sec
naive	501394.8 Ops/sec

HTML Preparation code:

<script src="//cdn.jsdelivr.net/npm/ramda@0.26.0/dist/ramda.min.js"></script>

Script Preparation code:

var l = _.range(1000).reduce( (acc, i) => ({...acc, i:  { id: i, name: 'test' }}), {} )
var r = _.range(40).reduce((acc, i) => ({...acc, i: { id: i, name: "test" + i }}), {} )

var mergeMapsOfRecords = (
  obj1,
  obj2,
  equalityChecker = apiRecordEqualityCheck
) => {
  const l = obj1 || {}
  const r = obj2 || {}
  const keys = Object.keys(r)
  const newMap = { ...l }

  for (const key of keys) {
    if (l.hasOwnProperty(key) && r.hasOwnProperty(key)) {
      if (equalityChecker(l[key], r[key])) {
        newMap[key] = l[key]
      }
      newMap[key] = { ...l[key], ...r[key] }
    } else {
      newMap[key] = r[key]
    }
  }

  return newMap
}

var apiRecordEqualityCheck = (record1, record2) => {
  if (
    record1.updatedAt &&
    record2.updatedAt &&
    record1.updatedAt === record2.updatedAt &&
    (Object.keys(record1).length && Object.keys(record2))
  ) {
    return true
  }
  return false
}

Tests:

Ramda
const a = R.mergeDeepRight(l, r)
naive
const b = mergeMapsOfRecords(l, r)

Run results for: Ramda vs. naive with equality checker

perf

Ramda

naive