Run results for: Map + filter vs reduce

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.80 Safari/537.36

Browser: Chrome 75

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
reduce	4245147.0 Ops/sec
filter+ map	3798280.0 Ops/sec

Script Preparation code:

var customers = [
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: true, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" },
      { active: false, name: "a", email: "b" }
  ];

Tests:

reduce
var emails = customers.reduce( (acc,c) => { if(c.active) { acc.push({ name: c.name, email: c.email } ); } return acc; }, []);
filter+ map
var emails = customers.filter( (c) => c.active) .map( (c) => ({ name: c.name, email: c.email }));

Run results for: Map + filter vs reduce

compare map + filter vs reduce

reduce

filter+ map