alexhawkins

class Array
  def sum_numbers
    sum = 0
    self.each { |num| sum += num }
    sum
  end
  
  def add_index
    self.each_with_index do |item, index|
        self[index] = "#{index} is #{item}"

alexhawkins

class Animal
  attr_accessor :name

  def initialize(name)
    @name = name
  end

  def eat(other)
    puts "#{@name} ate #{other.name}! #{self.noise}"
  end

alexhawkins

class Shape
  attr_accessor :color
  
  def initialize(color = nil)
    @color = color || 'Red'
  end
  
  def larger_than?(other)
    self.area >= other.area
  end

alexhawkins

def sort_by_length(sort_this_array)
  sort_this_array.sort { |x, y| x.length <=> y.length }
end

def filter(filter_this_array)
  filter_this_array.select { |v| v > 5 }
end

alexhawkins

map_this_array = "1 2 3 19 23 234 523 323 325 53 533 234 14 78 68676 46 990 67845"

p map_this_array.split.map(&:to_i).sort{|x,y| x <=> y}.join(", ")

# yields => "1, 2, 3, 14, 19, 23, 46, 53, 78, 234, 234, 323, 325, 523, 533, 990, 67845, 68676"

alexhawkins

class Array
  def new_map
    new_array = []
    self.each do |item|
      new_array << yield(item)
    end
    new_array
  end
  
  def new_map!(&block)

alexhawkins

'use strict';
var _ = require('underscore'); //require underscore library
/* NOTE: to use the above you need to install underscore on your computer first. 
If you are using node.js, type 'npm install underscore' at the command line. */ 

//##############EXERCISE 1######################

var slang = ['cool', 'sick', 'dope', 'wicked', 'boss'];
var slangObj = { word1: 'cool', word2: 'sick', word3: 'dope', word4: 'wicked', word5: 'boss' };

alexhawkins

'use strict';

//NUMBER 1

//sets first name
var setFirstName = function(firstName){
  //inner function allows us to alter last name
  var fullName = function(lastName){
    //note that the firstName has been saved
    //for use in our inner function

alexhawkins

'use strict';
var _ = require('underscore');

//######### EXAMPLE 1 #################/
//use _.reduce to multiply all the values in an array

var arr = [10,20,40,50,60,70];
var multiplied = _.reduce(arr, function (x, y) { return x * y; });

//tests

alexhawkins

'use strict';

/****************************************
* Chapter 3 Exercises: Functions
*****************************************

#EXERCISE 1: Minimum

The previous chapter introduced the standard function Math.min that returns 
its smallest argument. We can do that ourselves now. Write a function min that