Run results for: spread operator vs reusing object

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Mac OS X 10.12.6

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
spread operator	766852.1 Ops/sec
reuse object	792269.1 Ops/sec

Tests:

spread operator
const query = { 'ssoToken': '123', 'customerNum': '456' }; const proxyQueryParams = ['ssoToken', 'customerNum']; proxyQueryParams .filter(paramKey => query[paramKey] !== undefined) .reduce((params, paramKey) => ({ ...params, [paramKey]: query[paramKey], }), {});
reuse object
const query = { 'ssoToken': '123', 'customerNum': '456' }; const proxyQueryParams = ['ssoToken', 'customerNum']; proxyQueryParams .filter(paramKey => query[paramKey] !== undefined) .reduce((params, paramKey) => ({ ...params, [paramKey]: query[paramKey], }), {});