Maker Square Day 2

Here is the rough schedule for the day:

  • closures
  • underscore pt1
  • lunch
  • underscore pt1
  • this keyword
  • underscore pt 2
  • group meeting
  • dinner
  • lecture

I am being deliberately vague here. Somethings you have to pay to get the info, ya dig? I list it to illustrate that the days are fairly full right off the bat making me think they will ditch some of the “welcome to…”, “benefits” and “how to kick ass” type lectures in favor of even more JavaScript stuff.

Let’s see if my notes improved:

A closure is a function that has on going access to the variables of the context it was created in, even after outer function calls it was created in have returned.

assign Saga() to global var
 new Saga = function() {
 sagas.push(function(){ blah; }

Okay so not much better really but at least it had a basic definition of a closure. Here is a better example:

function init() {
// name is a local variable created by init
var name = "Mozilla";
// displayName() is the inner function, a closure
function displayName() {
alert(name); // use var declared in the parent function } displayName(); }; init();

Then we examined some underscore functions and the whats going on behind them.
_.extend = function(obj) {
_.each(arguments, function(passedObj){
_.each(passedObj, function(value,key) {
obj[key] = value;
return obj;

In Human:

for an object(s)
iterate over the arguments (objects)
iterate over each passed object
assign object[key] to the passed value

_.defaults = function(obj) {
  _.each(arguments, function(passedObj){
_.each(passedObj, function(key, value){
      if(obj[key] === undefined) {
obj[key] = value;
return obj;

In Human:

for an object(s)
iterate over objects arguments
if element does not exist in obj, add to obj

Interesting topic popped up about the !! convention. It forces coercian of the result to boolean.

Interview Question: How do you access a function inside of a return function? ()()… That is a bad note.. avoid this section.

Then there was a lecture on something about macs or something. I only just listened to this at the edges. I use linux so not much benefit, I took notes but I will never use them, so I am not typing them.

There was a cool GIT section though.
git remote -v //shows remotes
git remote add <username><username>/<repo&gt;.git
git branch -v show //shows branch
git checkout -b pairs //create and go to pairs branch
git checkout master
git push <username> branch:newBranch

Push to two repos in one command:
$ git remote -v
origin me@original:something.git (fetch)
origin me@original:something.git (push)
//add 'pairs' remote
git remote add pairs me@original:something.git
//add url
git remote set-url --add --push both git://somewhere/something.git
$ git push pairs


A new four letter word. In 4 steps.

  1. Debugger paused on this.
  2. Scan outward for function {}.
  3. once function containing this is found look at the where stack
  4. inspect syntax of how the function was called to see which run pattern is being is being used.

Run Patterns

  • Global Reference
    • Why?
      • Needs a value
    • What?
      • In a browser its window
    • example
      • this (not enclosed in any function)
  • Free Function Invocation
    • Why?
      • Needs a value…
    • What?
      • global object
    • example
      • functionName()
  • ABC (.apply, .bind, .call)
    • Why?
      • to manually pass in a this binding, like passing in an argument when invoking a function/method
    • What?
      • the first argument to .apply, .bind or .call
    • example
      • or obj.methodName(target)
  • Method Invocation
    • Why?
      • to execute the method in the context of the object they’re found in
    • What?
      • Object on the left of the call time dot
    • example
      • target.methodName();
  • Construction Mode
    • Why?
      • Allow a constructor to operate on the instance it is creating
    • What?
      • A new object created for that invocation
    • example
      • new functionName()

90% Rule

Inside a function, the keyword ‘this’ will be bound to the object that was left of the dot where that function was called.

The last lecture I took notes on was about some things to do and ways to think that can help you at Maker Square.

Set up a blog. Okay I was a little late on that but as they say blah blah late blah blah never.

There will be people here who work harder, learn faster, code stronger and think better than you…. learn to deal with that. (trust the program)

Have a growth mindset vs a fixed mindset. (trust the program)

This sparked a note for me to tell Muhammad about Richard Feynman, the ultimate in growth mindset.

Judge yourself by the core curriculum, not by others. They said this a few times. (trust the program)

Work hard, be strong and ask for help! (trust the program)

What does a professional developer look like?


Coders Block!

Learn the workflow, its important!