Run results for: optional function call

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/602.4.8 (KHTML, like Gecko) Version/10.0.3 Safari/602.4.8

Browser: Safari 10

Operating system: Mac OS X 10.12.3

Device Platform: Other

Date tested: 7 years ago

Script Preparation code:

var total = 0;
var f1;
var f2 = function() {
  total++;
};

Tests: