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var transform = function(collection, predicate){
  if (Array.isArray(collection)){
    return collection.map(predicate);
  } else if (typeof collection === 'string'){
    collection = collection.split('');
    return collection.map(predicate).join('');
  } else if (typeof collection === 'object'){
    return Object.keys(collection).reduce(function(results, property){
      results[property] = predicate(collection[property]);
      return results;

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function each(collection, predicate){
    if (Array.isArray(collection) || typeof collection === 'string'){
        for (var i = 0; i < collection.length; i++){
            predicate(collection[i]);
        }
    } else if(typeof collection === 'object') {
        for (var j in collection){
            predicate(collection[j]);
        }
    } 

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class UnitConversion
  def initialize(measurement, unit)
    @measurement = measurement
    @unit = unit
  end
  
  # Proxy with Kelvin
  def to_kelvin
    case @unit
    when 'celcius'

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#########
# PROXY #
#########

def fahrenheit_to_kelvin(value)                                                                                                                                    
  (value + 459.67) * 5 / 9                                                                                                                                         
end
 
def kelvin_to_celcius(value)                                                                                                                                       
  value -= 273.15                                                                                                                                                  

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require 'test_helper'

class RoutesTest < ActionDispatch::IntegrationTest
  test 'should create new post' do
    assert_routing({ path: 'posts', method: :post }, { controller: 'posts',
                                                       action: 'create' })
  end 

  test 'should get post' do
    assert_routing '/posts/1', { controller: 'posts', action: 'show', id: '1' }

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# == Schema Information
#
# Table name: friendships
#
#  id         :integer          not null, primary key
#  user_id    :integer
#  friend_id  :integer
#  created_at :datetime         not null
#  updated_at :datetime         not null
#

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module GroupHelper
  def admin(group)
    true if group.memberships.admin.where(user_id: current_user.id).present?
  end

  def regular(group)
    true if group.memberships.member.where(user_id: current_user.id).present?
  end
end

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# prints line numbers before each line & aligns the ":"

class ListGenerator
  def column_alignment(lines)
    lines = lines.split("\n")
    lines.map.with_index(1) do |output, line_number|
      "Line #{number_spacing(lines, line_number)}#{line_number}:  "\
      "#{output}"

    end

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# no "if" statement
def ternary(statement, true_result, false_result)
  (true && statement) && true_result || false_result
end

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def split_message(message)
  output_line = ""

  message.each_line.with_index(1) do |line, index|
    output_line << "Line #{index}: #{line}"
  end

  output_line
end