Run results for: groupBy (ramda vs custom impl)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36 OPR/66.0.3515.115

Browser: Opera 66

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
ramda	5014.4 Ops/sec
custom impl	9855.0 Ops/sec

HTML Preparation code:

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

Script Preparation code:

function groupBy(n,r){return 1===arguments.length?function(r){return groupBy(n,r)}:r.reduce(function(r,u){var t=n(u);return r[t]?r[t].push(u):r[t]=[u],r},{})}

var students = [...Array(3000)].map((v, i) => {
  return {
    value: parseInt(Math.random() * 100, 10),
    score: parseInt(Math.random() * 100, 10)
  }
})

var fn = function(student) {
  var score = student.score;
  return score < 65 ? 'F' :
         score < 70 ? 'D' :
         score < 80 ? 'C' :
         score < 90 ? 'B' : 'A';
}

Tests:

ramda
var byGrade = R.groupBy(fn); byGrade(students)
custom impl
var byGrade = groupBy(fn); byGrade(students)