Run results for: Array.map vs reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Array.map	4900716.0 Ops/sec
Reduce	275617.7 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