Snake.js

function Snake(){
	this.x = 0;
	this.y = 0;
	this.xspeed = 1;
	this.yspeed = 0;
	this.total = 0;
	this.tail = [];

	this.dir = (x, y) => {
		this.xspeed = x;
		this.yspeed = y;
	}

	this.death = () => {
		for(let i = 0; i < this.tail.length; i++){
			let pos = this.tail[i];
			let d = dist(this.x, this.y, pos.x, pos.y);
			if(d < 1) {
				this.total = 0;
				this.tail = [];
				score.innerHTML = 'Game over!'
			}
		}
	}

	this.eat = (pos) => {
		var d = dist(this.x, this.y, pos.x, pos.y);
		if(d < 1){
			this.total++;
			score.innerHTML = 'Score: ' + this.total;
			return true;
		}else{
			return false;
		}
	}

	this.update = () => {

		if(this.total === this.tail.length){
			for(let i = 0; i < this.tail.length-1; i++){
				this.tail[i] = this.tail[i+1];
			}
		}
		this.tail[this.total-1] = createVector(this.x, this.y);

		

		this.x = this.x + this.xspeed * scl;
		this.y = this.y + this.yspeed * scl;

		this.x = constrain(this.x, 0, width-scl);
		this.y = constrain(this.y, 0, height-scl);

	}

	this.show = () => {
		fill(255);
		for(let i = 0; i < this.tail.length; i++){
			rect(this.tail[i].x, this.tail[i].y, scl, scl);
		}
		rect(this.x, this.y, scl, scl);
	}
}