Run results for: Compare performance between 2 constructors pattern

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36

Browser: Chrome 67

Operating system: Mac OS X 10.13.1

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Basic constructor pattern	75177.6 Ops/sec
Constructor with prototype pattern	75104.1 Ops/sec

Script Preparation code:

function CarA( model, year, miles ) {
  this.model = model;
  this.year = year;
  this.miles = miles;
 
  this.toString = function () {
    return this.model + " has done " + this.miles + " miles";
  };
}

function CarB( model, year, miles ) {
  this.model = model;
  this.year = year;
  this.miles = miles; 
}
 
CarB.prototype.toString = function () {
  return this.model + " has done " + this.miles + " miles";
};

Tests:

Basic constructor pattern
var civic = new CarA( "Honda Civic", 2009, 20000 ); console.log( civic.toString() );
Constructor with prototype pattern
var civic = new CarB( "Honda Civic", 2009, 20000 ); console.log( civic.toString() );

Run results for: Compare performance between 2 constructors pattern

Basic constructor pattern

Constructor with prototype pattern