Run results for: split...reduce vs split...map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.77 Safari/537.36

Browser: Chrome 91

Operating system: Mac OS X 10.15.2

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
split...reduce	391.5 Ops/sec
split...map	404.7 Ops/sec

Script Preparation code:

var classArray = [];
for (var i=0; i < 10000; i++) {
  classArray.push('class-name');
}
var classes = classArray.join(' ' );

Tests:

split...reduce
classes.split(' ').reduce((acc, item)=>{ return { ...acc, [item]: true, }; }, {});
split...map
classes.split(' ').map(item=> ({[item]: true}));