Benchmarking `_.compact` vs. Branching

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node_modules/

README.md

Benchmarking _.compact vs. Branching

Running the microbenchmark produces

$ npm run benchmark

> @ benchmark ...
> node index.js

withBranching x 27,485,424 ops/sec ±1.68% (77 runs sampled)
withCompact x 19,542,005 ops/sec ±1.28% (77 runs sampled)

The comparison is between just branching

const result = [];
if (OPTIONS.u) { result.push({ u: 10 }); }
if (OPTIONS.v) { result.push({ v: 11 }); }
if (OPTIONS.w) { result.push({ w: 12 }); }
if (OPTIONS.x) { result.push({ x: 13 }); }
if (OPTIONS.y) { result.push({ y: 14 }); }
if (OPTIONS.z) { result.push({ z: 15 }); }

and using _.compact on an array with potentially false-y entries

const result = _.compact([
  OPTIONS.u && { u: 10 },
  OPTIONS.v && { v: 11 },
  OPTIONS.w && { w: 12 },
  OPTIONS.x && { x: 13 },
  OPTIONS.y && { y: 14 },
  OPTIONS.z && { z: 15 }
]);

index.js

const Benchmark = require("benchmark");
const _ = require("lodash");

const OPTIONS = {
  u: true,
  x: true,
  y: true,
};

function withBranching() {
  const result = [];
  if (OPTIONS.u) { result.push({ u: 10 }); }
  if (OPTIONS.v) { result.push({ v: 11 }); }
  if (OPTIONS.w) { result.push({ w: 12 }); }
  if (OPTIONS.x) { result.push({ x: 13 }); }
  if (OPTIONS.y) { result.push({ y: 14 }); }
  if (OPTIONS.z) { result.push({ z: 15 }); }
  return result.length === 3;
}

function withCompact() {
  const result = _.compact([
    OPTIONS.u && { u: 10 },
    OPTIONS.v && { v: 11 },
    OPTIONS.w && { w: 12 },
    OPTIONS.x && { x: 13 },
    OPTIONS.y && { y: 14 },
    OPTIONS.z && { z: 15 },
  ]);
  return result.length === 3;
}

function main() {
  const suite = new Benchmark.Suite();
  suite
    .add("withBranching", withBranching)
    .add("withCompact", withCompact)
    .on("cycle", function(event) {
      console.log(String(event.target));
    })
    .run({ async: true });
}

if (require.main === module) {
  main();
}

package-lock.json

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "benchmark": {
      "version": "2.1.4",
      "resolved": "https://registry.npmjs.org/benchmark/-/benchmark-2.1.4.tgz",
      "integrity": "sha1-CfPeMckWQl1JjMLuVloOvzwqVik=",
      "requires": {
        "lodash": "^4.17.4",
        "platform": "^1.3.3"
      }
    },
    "lodash": {
      "version": "4.17.15",
      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
    },
    "platform": {
      "version": "1.3.5",
      "resolved": "https://registry.npmjs.org/platform/-/platform-1.3.5.tgz",
      "integrity": "sha512-TuvHS8AOIZNAlE77WUDiR4rySV/VMptyMfcfeoMgs4P8apaZM3JrnbzBiixKUv+XR6i+BXrQh8WAnjaSPFO65Q=="
    }
  }
}

package.json

{
  "scripts": {
    "benchmark": "node index.js"
  },
  "dependencies": {
    "benchmark": "2.1.4",
    "lodash": "4.17.15"
  }
}