README

This is my attempt at Snake in javascript, meant mainly to use javascript in a "meaningful" way.

This README alsocontains all my design notes, 


snake design:

Initialise variables

At every tick:
  update input vector
  try to move:
  	if touches snake then 
  		gameover
  	if touches nugget then
  		eat nugget
  		add new nugget
  		add 1 length to snake
  	else 
  		move snake accordingly 
  



Representation of snake:
	list of points
	functions:
		move 
		set direction
		lengthen
		existence at point

Representation of world:
	snake
	tick function
	nugget position




html inclusion:

just making it a div? <div class="snake"> ... ?
I'm fine with this.



snake representation details


the pointlist that holds the "parts" of the snake...... hiow do they work?

If I have three parts, for example, in order
 
 0--1--2

 when I move I could just move 0: 
    
    1--2--0

in which case 1 would be the new last.


so point list works like a circular buffer: there's a "current tail", as well as a "current head". We increment each every time. 

This might seem like enough, but there's a slight problem.... adding requires a lot of shifting.

So I'll use a linked list. (or rather, just a cobbled together node list. I can't write linked list functionality correctly otherwise!)

The design remains similar.

When adding a thing, we'll just duplicate the tail....

before add:

0--1--2

hd: 2 -> 0
tl: 0 -> 1

adding an el't:

0/3--1--2

hd: 2->3 

tl: 3->0


after "step":

 0--1--2--3


 BAM!