Run results for: test123kjfhneurkgewrxfiewhlrugxerg123

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
1	7255506.5 Ops/sec
2	3090829.8 Ops/sec

Script Preparation code:

var getLabel = (key) => {
  switch (key) {
    case 'a':
    	return 'a';
    case 'b':
    	return 'b';
    default:
    	return 'c';
  }
}

var dictionary = {
  a: 'a',
  b: 'b',
  c: 'c',
}

Tests:

1
const obj = {}; for (const key of Object.values(dictionary)) { obj[key] = { value: key, label: getLabel(key), } }
2
const obj = Object.fromEntries(Object.values(dictionary).map((item) => ([item.value, item])));