Objectives

Javascript Classes

1. Define a constructor function using ES5 syntax.

function Email(sender, text) {
  this.sender = sender;
  this.text = text;
}

2. Define a method on the prototype of a constructor function.

function Email(sender, text) {
  this.sender = sender;
  this.text = text;
}

Email.prototype.getTextAndSender = function () {
  return `${this.sender}: ${this.text}`;
};

3. Declare a class using ES6 syntax.

class Email {
  constructor(sender, subject, text) {
    this.sender = sender;
    this.subject = subject;
    this.text = text;
  }
}

4. Define an instance method on a class (ES6).

class Email {
  constructor(sender, subject, text) {
    this.sender = sender;
    this.subject = subject;
    this.text = text;
  }

  getStuff() {
    return `${this.sender} : ${this.text}`;
  }
}

5. Define a static method on a class (ES6).

class Email {
  constructor(sender, subject, text) {
    this.sender = sender;
    this.subject = subject;
    this.text = text;
  }

  static getStuff() {}
}

6. Instantiate an instance of a class using the new keyword.

const verizon = new ServiceProvider("Verizon");

7. Implement inheritance using the ES6 extends syntax for an ES6 class.

class Email {
  constructor(sender, subject, text) {
    this.sender = sender;
    this.subject = subject;
    this.text = text;
  }
}

class DangerousEmail extends Email {
    constructor(sender, subject, text, malware) {
        super(sender, subject, text) {
            this.malware = new Malware;
        }
    }
}

8. Utilize the super keyword in a child class to inherit from a parent class.

class DangerousEmail extends Email {
    constructor(sender, subject, text, malware) {
        super(sender, subject, text) {
            this.malware = new Malware;
        }
    }
}

9. Utilize module.exports and require to import and export functions and class from one file to another.

module.exports = {
  One: One,
  Two: Two,
  Three: Three,
};

const fs = require("fs");
const lodash = require("lodash");
const something = require("./something.js");