ncatalin
3/1/2018 - 3:39 PM

Constructors & the 'this' Keyword

Modern JavaScript From The Beginning from Brad Traversy

index.html
content_copyfile_download
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>JavaScript Sandbox: Section 5</title>
</head>
<body>
  <h1>JavaScript Sandbox: Section 5</h1>

  <script src="app.js"></script>
</body>
</html>
app.js
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// Person constructor
function Person(name, dob) {
  this.name = name;
  // this.age = age;
  this.birthday = new Date(dob);
  this.calculateAge = function(){
    const diff =  Date.now() - this.birthday.getTime();
    const ageDate = new Date(diff);
    return Math.abs(ageDate.getUTCFullYear() - 1970);
  }
}

// const brad = new Person('Brad', 36);
// const john = new Person('John', 30);

// console.log(john.age);

const brad = new Person('Brad', '9-10-1981');
console.log(brad.calculateAge());