Game.Entity = function(properties) {
    properties = properties || {};
    // Call the glyph's construtor with our set of properties
    Game.Glyph.call(this, properties);
    // Instantiate any properties from the passed object
    this._name = properties['name'] || '';
    this._x = properties['x'] || 0;
    this._y = properties['y'] || 0;
    // Create an object which will keep track what mixins we have
    // attached to this entity based on the name property
    this._attachedMixins = {};
    // Setup the object's mixins
    var mixins = properties['mixins'] || [];
    for (var i = 0; i < mixins.length; i++) {
        // Copy over all properties from each mixin as long
        // as it's not the name or the init property. We
        // also make sure not to override a property that
        // already exists on the entity.
        for (var key in mixins[i]) {
            if (key != 'init' && key != 'name' && !this.hasOwnProperty(key)) {
                this[key] = mixins[i][key];
            }
        }
        // Add the name of this mixin to our attached mixins
        this._attachedMixins[mixins[i].name] = true;
        // Finally call the init function if there is one
        if (mixins[i].init) {
            mixins[i].init.call(this, properties);
        }
    }
}

Game.Entity.prototype.hasMixin = function(obj) {
    // Allow passing the mixin itself or the name as a string
    if (typeof obj === 'object') {
        return this._attachedMixins[obj.name];
    } else {
        return this._attachedMixins[name];
    }
}

// Create our Mixins namespace
Game.Mixins = {};

// Define our Moveable mixin
Game.Mixins.Moveable = {
    name: 'Moveable',
    tryMove: function(x, y, map) {
        var tile = map.getTile(x, y);
        // Check if we can walk on the tile
        // and if so simply walk onto it
        if (tile.isWalkable()) {
            // Update the entity's position
            this._x = x;
            this._y = y;
            return true;
        // Check if the tile is diggable, and
        // if so try to dig it
        } else if (tile.isDiggable()) {
            map.dig(x, y);
            return true;
        }
        return false;
    }
}

// Player template
Game.PlayerTemplate = {
    character: '@',
    foreground: 'white',
    background: 'black',
    mixins: [Game.Mixins.Moveable]
}

var john = {
  name: 'John',
  greet: function() { return `Hi, I'm ${this.name}` }
}

function addRunningAbility(person) {
  person.run = function() { return `${this.name} is running!` }
  return person;
}
addRunningAbility(john);
john.run();

function run(person) {
  return `${person.name} is running!`
}

function addRunningAbility(person) {
  return Object.assign({}, person, 
    {run: function() { return `${this.name} is running!` }
  });
}

#!/bin/bash

# examples: change to whatever file extensions you are using.
# or add file extensions...
declare -a arr=("js" "rb")
ttl=0

shopt -s globstar
IFS=' '

#change directory to wherever you are keeping your program
cd /my_program

for i in "${arr[@]}"
do
    n=( $(wc -l **/*."$i" | grep "total") )
    echo "$i" $n
    ttl=$(($ttl + $n))
done

echo ""
echo "total"
echo $ttl