Run results for: yoyoyo - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Browser: Chrome 60

Operating system: Mac OS X 10.12.6

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
a	424641.9 Ops/sec
b	426038.5 Ops/sec

Script Preparation code:

var over1 = [{
id: 'dtm',
isVisible: false
},{
id: 'nap',
isVisible: true
}];

var over2 = [{
id: 'dtm',
isVisible: true
}];

Tests:

a
return over1.filter(el => { return !over2.find(item => item.id === el.id); }).map(layer => layer.id);
b
return over1.filter(el => { return !over2.some(item => item.id === el.id); }).map(layer => layer.id);