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square_of_sum = (1..100).reduce(:+) ** 2

sum_of_square = (1..100).inject {|sum, n| sum + n ** 2}

p square_of_sum - sum_of_square

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Twitter Gem Cheat Sheet

For documentation, please read this link http://www.rubydoc.info/gems/twitter#Documentation

User location will be a null object if user didn't input location.

Data needed: followers followings

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DBC Final Project Wireframe

• Home No User Login

https://wireframe.cc/EDJUhj

• Home User Login

https://wireframe.cc/QutweR

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Meteor.js

Cheatsheet for Meteor.js beginner

To install Meteor on OS X or Linux

curl https://install.meteor.com/ | sh

To create project

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###This is H3

def method(arg)

arg
end

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Javascript Lecture

Closure

function(thisOtherNumber){
  return numberToAdd + theOtherNumber;  
}

That function remembers variables numberToAdd that were around when the function was declared.

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Handlebars
- Clinet side JS templating engine
- JS library included in the HTML page
- Allows adding templates to your HTML page

Reason to use a JS tempting engine
- fast, on clinet side
- easier to read with a lot of string interpolation.

When to use JS tempting engine

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OOJS
CRUD
AJAX


prototype in js?
not expected to write test

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$("a").click(function(e) {
  e.preventDefault();                                         // prevent default action
  
  $.ajax{
    url: $(this).attr("href"),
    dataType
    }).done(function(data) {    // ajax call
    
  })
})

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#Object Oriented Javascript

#Overview

• Creating Objects in JavaScript
  • new Object();
  • Object Literal Notation (Important)
  • Factory Function
• Review JavaScript's this
• More Creating Objects in JavaScript
• Constructor Function