The Basics:

For the sake of learning and not getting skewed results, I am scripting each piece of code within its own function. Within the foot of each page, the reader will find associated pages - for example "array methods" will feature in the foot of the array pages. The reader will also find links to useful sites such as w3schools/js. However, in the code examples pages, I hope to write code for each example - for example, all the DOM methods.

Comments within code:

1. // This is a single line comment.

2. /* This is a multi-line comment.

   For larger comments that take more sentences. */

Outputting code on this website:

1. console.log

   Writes or returns code in the console. To see code here, use the dev tools to inspect these pages and choose "console".

   An example:

   Write "Hello World!" in the console
2. alert

   Writes or returns code as a popup alert.

   An example:

   Alert "Hello World!"
3. document.write
   1. Writing text in the browser:

      An example:

      Insert "Hello World!" in the browser

   2. Replacing text in the browser:

      An example:

      Replace text with "Hello World!" in the browser

      This text will be replaced

      Reset

Throughout this site, I will use the various methods, but especially document.write(); and alert(); because these will not need the reader going to the console. At times, I may refer to an outside code host such as codepen:

Variables:

1. var

   var can be redeclared.

2. let

   let can not be redclared. Common practice dictates that let is the best to use, so unless stated, all variabled here will be declared using let.

3. const

   const can not be redeclared. Ever. (When I say ever, I mean within its own script and those that communicate with it.)

They also have different levels of scope.

Data Types:

1. Numbers
1. integer

   A real number

2. floating-point number or float

   A number with decimal points.

3. Special numbers

   infinity, -infinity, NaN.

2. "strings"

`Textual data. A sentence, a word, number or character. Always enclosed with some kind of speech marks. The template literals surrounding this paragraph are the best to use, as they allow much more flexibility when writing code.`

3. [arrays]

   [A set. Can be any type of data type, or a mixture of. Always enclosed with square brackets.]

4. Objects

Data that represents things rather than values. Object oriented principles are based on objects, instead of the actions and data.

function():

1. name function()

   A function expression.

2. function name()

   A function declaration.

The two give very different results. More information here.