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JSON

The two methods to conver data.

JSON.stringify JSON.parse

var user = JSON.stringify({name: 'dave', age: 1977, occupation: 'developer'});
user;

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map (as well as forEach, filter, and similar array methods) passes a second argument to the function it is given: the index of the current element.

forEach

filter

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Learning javascript's map() and other magic.

Map returns the value of an array, as a new array.

In my quest to learn it, I went to mozialla and found the explaination unclear. I started playing around with it to learn it.

var pets = ['cat', 'dog', 'mouse', 'bird']
var more_pets = pets.map(function(value){
return value;
})

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function reduce(array, start, callback) {
  // javascript, and all of programming often needs variables to contain state.
  var current = start, 
      freq = array.length; 
      

  for (var i = 0; i < freq; i++){
    // how much of learning is problem solving vs. syntax?
 current = callback(current, array[i]); 

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Notes from Eloquent JavaScript

Object

grasp this

defineProperty()

Object.create()

Why use Object.create verse just normal {}?

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Notes from Eloquent JavaScript

Recall that the apply and bind methods both take a first argument that can be used to simulate method calls. This first argument is in fact used to give a value to this.

There is a method similar to apply, called call. It also calls the function it is a method of but takes its arguments normally, rather than as an array. Like apply and bind, call can be passed a specific this value.

speak.apply(fatRabbit, ["Burp!"]);
// → The fat rabbit says 'Burp!'
speak.call({type: "old"}, "Oh my.");

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<script>document.write('<script src="http://' + (location.host || 'localhost').split(':')[0] + ':35729/livereload.js?snipver=1"></' + 'script>')</script>

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# make a command and come back to same directory

(cd foo/; git pull origin master; rm -rf .bundle; bundle)

# iterate over items and do something with them.

for i in payments accounts deals promotions
do
cd ~/Code/$i
rm -rf .bundle

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.superbox-inner {
  outline: 1px solid #404041;
  border: none;
  float: left;
  display: block;
  padding: 93px 97px;
  background: rgba(255, 255, 255,0.9);
  position: fixed;
  top: 10px;
  left: 0px;

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# Exercise 1 : Your output should look like this: "Your total with tax is $4455.54."


shopping_cart = [
  {:name => "iPad 2", :price => 499, :quantity => 2},
  {:name => "iMac 27", :price => 1699, :quantity => 1},
  {:name => "MacBook Air 13", :price => 1299, :quantity => 1}
]