ES6: Use class Syntax to Define a Constructor Function

ES6: Use class Syntax to Define a Constructor Function
ES6 provides a new syntax to help create objects, using the keyword class.

This is to be noted, that the class syntax is just a syntax, and not a full-fledged class based implementation of object oriented paradigm, unlike in languages like Java, or Python, or Ruby etc.

In ES5, we usually define a constructor function, and use the new keyword to instantiate an object.

var SpaceShuttle = function(targetPlanet){
  this.targetPlanet = targetPlanet;
}
var zeus = new SpaceShuttle('Jupiter');
The class syntax simply replaces the constructor function creation:

class SpaceShuttle {
  constructor(targetPlanet){
    this.targetPlanet = targetPlanet;
  }
}
const zeus = new SpaceShuttle('Jupiter');
Notice that the class keyword declares a new function, and a constructor was added, which would be invoked when new is called - to create a new object.


Use class keyword and write a proper constructor to create the Vegetable class.

The Vegetable lets you create a vegetable object, with a property name, to be passed to constructor.

Selecting from Many Options with Switch Statements

If you have many options to choose from, use a switch statement. A switch statement tests a value and can have many case statements which define various possible values. Statements are executed from the first matched case value until a break is encountered.

Here is a pseudocode example:

switch(num) {
  case value1:
    statement1;
    break;
  case value2:
    statement2;
    break;
...
  case valueN:
    statementN;
    break;
}
case values are tested with strict equality (===). The break tells JavaScript to stop executing statements. If the break is omitted, the next statement will be executed.


Write a switch statement which tests val and sets answer for the following conditions:
1 - "alpha"
2 - "beta"
3 - "gamma"
4 - "delta"

Basic JavaScript: Return a Value from a Function with Return

We can pass values into a function with arguments. You can use a return statement to send a value back out of a function.

Example

function plusThree(num) {

  return num + 3;

}

var answer = plusThree(5); // 8

plusThree takes an argument for num and returns a value equal to num + 3.

Create a function timesFive that accepts one argument, multiplies it by 5, and returns the new value. See the last line in the editor for an example of how you can test your timesFive function.

Caesars Cipher

One of the simplest and most widely known ciphers is a Caesar cipher, also known as a shift cipher. In a shift cipher the meanings of the letters are shifted by some set amount.

A common modern use is the ROT13 cipher, where the values of the letters are shifted by 13 places. Thus 'A' ↔ 'N', 'B' ↔ 'O' and so on.

Write a function which takes a ROT13 encoded string as input and returns a decoded string.

All letters will be uppercase. Do not transform any non-alphabetic character (i.e. spaces, punctuation), but do pass them on.

Falsy Bouncer

• Remove all falsy values from an array.

• Falsy values in JavaScript are false, null, 0, "", undefined, and NaN.

• Remember to use Read-Search-Ask if you get stuck. Write your own code.

Here are some helpful links:

Boolean Objects
Array.prototype.filter()