Run results for: Map constructor and setter

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Map setting	4557558.5 Ops/sec
Map constructor	4170383.0 Ops/sec

Script Preparation code:

var arr = [
  { a: 'Ghkfj', b: 'Yvtzq', c: 'Rwsde' },
  { a: 'Bpqwm', b: 'Sdfgh', c: 'Zxcvb' },
  { a: 'Olmnp', b: 'Iujkl', c: 'Qwerty' },
  { a: 'Cdsaf', b: 'Asdfg', c: 'Xcvbn' },
  { a: 'Qwerz', b: 'Cvbnm', c: 'Xcvbn' }
]

Tests:

Map setting
const map = new Map() arr.forEach(el => map.set(el.a, el))
Map constructor
const map = new Map(arr.map(el => [el.a, el]))

Run results for: Map constructor and setter

perfomance with adding elements

Map setting

Map constructor