Run results for: Array.map vs reduce

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Browser: Chrome 66

Operating system: Mac OS X 10.12.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Array.map	8454426.0 Ops/sec
Reduce	429997.1 Ops/sec

Script Preparation code:

var items = [
  {
    field_id: 89107336,
    values: [{ value: "Star Warz" }]
  },
  {
    field_id: 89107337,
    values: [{ date: "December 24, 2015" }]
  },
  {
    field_id: 89107415,
    values: [
      {
        value: { item_id: 1234123 }
      },
      {
        value: { item_id: 4746576 }
      }
    ]
  },
  {
    field_id: 89107340,
    values: [{ value: "5.00" }]
  },
  {
    field_id: 89107344,
    values: [{ value: "This is description" }]
  },
  {
    field_id: 89107348,
    values: [
      {
        value: { file_id: 234234 }
      }
    ]
  }
]

Tests:

Array.map
items.map((item) => item.field_id)
Reduce
items.reduce((acum, current) => acum.concat(current), [])

Run results for: Array.map vs reduce

Array.map

Reduce