Run results for: If Lookup vs. Switch Lookup

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.3 Safari/605.1.15

Browser: Safari 12

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
If Lookup	3512469.0 Ops/sec
Switch Lookup	4993029.0 Ops/sec

Script Preparation code:

var ERRORS = {
  400: 'Bad Request',
  401: 'Unauthorized',
  403: 'Forbidden',
  404: 'Not Found',
};

var serverResponse = {
  error: 404,
};

Tests:

If Lookup
function mappingError (response) { let errorCode = 400; if (response && response.error && ERRORS[response.error]) { errorCode = response.error; } return ERRORS[errorCode]; } mappingError(serverResponse);
Switch Lookup
function switchError (response) { switch (response.error) { case 400: return ERRORS[400]; case 401: return ERRORS[401]; case 402: return ERRORS[402]; case 404: return ERRORS[404]; default: return ERRORS[400]; } } switchError(serverResponse);