Run results for: testtest132123asdasda

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
B	1196326.0 Ops/sec
C	1713907.0 Ops/sec

Script Preparation code:

 var getClass = {}.toString,
      hasProperty = {}.hasOwnProperty,
      expression = /Kit/g;
  
  function Test() {}
  
  // Checks the internal [[Class]] name of the object.
  
  
  function isFunctionA(object) {
   return object && getClass.call(object) == '[object Function]';
  }
  
  // Partial duck-typing implementation by Garrett Smith.
  
  
  function isFunctionB(object) {
   if (typeof object != 'function') return false;
   var parent = object.constructor && object.constructor.prototype;
   return parent && hasProperty.call(parent, 'call');
  }
  
  // Pure duck-typing implementation taken from Underscore.js.
  
  
  function isFunctionC(object) {
   return !!(object && object.constructor && object.call && object.apply);
  }

Tests:

B
isFunctionB(Test); isFunctionB(getClass); isFunctionB(hasProperty); !isFunctionB(expression);
C
isFunctionC(Test); isFunctionC(getClass); isFunctionC(hasProperty); !isFunctionC(expression);