Run results for: lodash fp vs pure js v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40

Browser: Chrome 95

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
pure js	4084569.8 Ops/sec
lodash fp	126312.7 Ops/sec
generator, filter + map	133280.5 Ops/sec
generator, filterMap	588918.6 Ops/sec
pure js, reversed	3048743.0 Ops/sec

HTML Preparation code:

<script src="//cdnjs.cloudflare.com/ajax/libs/lodash-fp/0.10.4/lodash-fp.min.js"></script>

Script Preparation code:

var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30];

function* map(f, xs) {
  for (const x of xs) {
    yield f(x);
  }
}

function* filter(f, xs) {
  for (const x of xs) {
    if (f(x)) {
      yield(x);
    }
  }
}

function* filterMap(f, g, xs) {
  for (const x of xs) {
    if (f(x)) {
      yield g(x);
    }
  }
}

Tests:

pure js
var pure = numbers.filter(num => num % 2 === 0).map(num=> ({ result: num }));
lodash fp
_.flow(_.map(num => ({ result: num })), _.filter(num => num % 2 === 0))(numbers);
generator, filter + map
var pure = [...filter(num => num % 2 === 0, map(num => ({ result: num }), numbers))];
generator, filterMap
var pure = [...filterMap(num => num % 2 === 0, num => ({ result: num }), numbers)];
pure js, reversed
var pure = numbers.map(num=> ({ result: num })).filter(({result}) => result % 2 === 0);

Run results for: lodash fp vs pure js v2

pure js

lodash fp

generator, filter + map

generator, filterMap

pure js, reversed