mathildathompson

#Javascript

Scope

####Introduction When you declare a variable for the first time, you must use the var keyword, but when you update the value within the variable, you don't use the var keybord.

var pocket = ['phone', 'kindle'];
pocket = ['oysterCard', 'keys'];

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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 npm install -g coffee-script //Globally install node package; 
 
 npm install coffee-script //Install locally in the folder; //Like locally installing a gem; 
 
 node node_modules/coffee-script/bin/coffee
 
 node_modules/coffee-script/bin/coffee hello.coffee
 
 //Need to compile to Javascript for the browser to read; 
 

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Ruby 2.1.0 #major version, minor version and the patch level; Rails 4.1.0

##Semantic versioning Left most number is the version number, this is the particular version, brand new version, if you wanna use with old code you need to read documentation; Rails 4.2.0 Rails 4.3.5 #Stuff that has the same major version number is all compatible with each other;

##Tags Let you put a specific name to a particular version;

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def each(&block)
  node = @head
  while node
    block.class(node.value)
  end
end

#A minix a way of adding extra data to the class without having to use inheritance; 
#You can only inherit from one class, a way to get around this is to created mixins; 

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//nodejs.org
//CANARY is the next version of CHROME; 
//CHROMIUM -> CANARY -> CHROME: 
node //Type this into terminal; 
//Node is now running on the server on ts own; 
0.1 + 0.2
console.log('hi');
//It is so fast as it has not features out of the box; 
//Bare bones, all driven by callBacks;Uses those same ideas over and over again; 

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var DNAStringFactory = function(string){
    var DNA = {
        string: string,
        count: function(letter){
            if (!_.contains(['A', 'G', 'C', 'T', 'U'], letter)){
                return alert('This is not valid!');
            }

            var result = _.filter(this.string, function(nucleotide){
                return nucleotide == letter;

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$(document).ready(function(){
  if(! window.DeviceOrientationEvent){
    return;
  }
  
  $(window).on('deviceorientation', function(){
    console.log('device-reorientated');
  })
  console.log('everything is fine');
});

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#Takes all commands written in text and converts into magic numbers, compiles into executable byte code which is Ruby specific; 
#Converts english language into byte code, executes the byte code; 
#The byte code is the sameo on every system (if you were running on mac or nintendo); 
#To make it work it has to call the operating system; 

#Opaerting system, library that knows how to open and close files, talk to the network, do mathemtatical stuff #When you intall operating system comes which a bunch of libraries; 
#Ruby talks to the operating system which talks to the libraries; 

#Underneath the operating system we have to BIOS (basic input output system). It knows how to talk with the hardward, what is the resolution of the screen, is a keyboard attached. The bios is read only; 
#Underneath the bios was have the hardware. This is the horrible stuff to do with voltage etc. 

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Array.prototype.each_slice = function (size, callback){
    console.log(this.length, 'Size', size, 'Callback', callback);
    for (var i = 0, l = this.length; i < l; i += size){
        callback.call(this, this.slice(i, i + size));
    }
};

var Crypto = function(messageString){
    this.message = messageString;
}