Run results for: maps vs objects - filters

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Object.values

691/s

for-in

240/s

View exact numbers

Test name	Executions per second
✓ Object.values	691 Ops/sec
for-in	240 Ops/sec

Script Preparation code:

var obj = {
  'a': {
    id: 'a',
    num: 1
  },
  'b': {
    id: 'b',
    num: 1
  },
  'c': {
    id: 'c',
    num: 1
  },
  'd': {
    id: 'd',
    num: 1
  },
  'e': {
    id: 'e',
    num: 1
  },
  'f': {
    id: 'f',
    num: 1
  },
  'g': {
    id: 'g',
    num: 1
  },
};
var objmap = new Map(Object.entries(obj))
function filter(value) {
  return value.id === 'c'
}

Tests:

for-in
for (var i=10000; i > 0; i--) { Array.from(objmap.values()).filter(filter); }
Object.values
for (var i=10000; i > 0; i--) { Object.values(obj).filter(filter); }