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JavaScript II Mini

Topics we will cover

  • Recursion
  • the this keyword
  • constructor functions
  • classes

Instructions

  • This repository is provided as more of a follow along structure.

  • In class we will be going over the principles listed above and you will be expected to follow along when the instructor asks you to do so.

Recursion

What it is

  • recursion is another way to represent a looping program.
  • Simliar to a for loop or a while loop a recursive function will loop until you tell it to stop.
  • when solving complex algorithms recursion comes in handy. It is not that great for smaller, less complex algorithms.
  • For every recursive function, you'll need to establish what is called a base case. A base case is a condition that when triggered, will discontinue the call to your function.

The this keyword

  • Because JavaScript is both an Object Oriented and Functional Programming language, it has some very interesting concepts built into it.
  • The 'this' keyword is one of those querky concepts that tend to trip up a lot of people coming into JavaScript.
  • You can think of this, as a Pointer to an object. For example, you can use the this keyword to reference an object without having to refer to that object's name.
  • example
  const myObj = { 
    name: 'Freddy' 
    greet: function() {
      console.log(`hello my name is ${this.name}`);
    }
  };
  myObj.greet();
  • In the above example the "this" keyword becomes active when a person's name is called.
  • Tyler McGinnis' four rules to the 'this' keyword. found here
    1. Window Binding
    2. Implicit Binding
    3. New Binding
    4. Explicit Binding

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