Category: Uncategorized

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How to Setup Your Own Parse Server

Since you already have heard that parse is closing down. Here are some instruction to set up you own parse. You can read more about the announcement here. You Can set up Parse with heroku or AWS.

The guides are at:

Heroku: https://devcenter.heroku.com/articles/deploying-a-parse-server-to-heroku

AWS: http://mobile.awsblog.com/post/TxCD57GZLM2JR/How-to-set-up-Parse-Server-on-AWS-using-AWS-Elastic-Beanstalk

If you’re not sure which to choose I’d go for Heroku as the process is a fair bit more straightforward.

Happy Coding. Now you have your own backend.

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Javascript – Simple For Loop Examples

These are some examples of simple for loop challenges and exercises I did for fun.

// Print 'hello' the string vertically
var str = 'hello';
for(var count = 0; count < str.length; count++) {
	console.log(str[i])
}
// print all numbers between -10 and 19

for(var i = -10; i < 20; i++) {
	console.log(i)
}

// print even numbers between 10 and 40

for(var i = 10; i < 40; i++) {
	if(i % 2 === 0){
	console.log(i)
	}
}
// print all odd numbers between 300 and 333
for(var i = 300; i < 333; i++) {
	if(i % 3 === 0){
	console.log(i)
	}
}
// print all numbers divisible by 5 and 3 between 5 and 50
for(var i = 5; i < 50; i++)	{
	if(i % 3 === 0 && i % 5 === 0) {
	console.log(i)
	}
}
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Javascript can be dynamically typed – Array Example

This is code example of javascript being dynamically typed with arrays. Arrays can store, anything: strings, objects, functions, strings, and integers. Below is example how to call an object lateral and function. Remember arrays start count at 0.

var arr = [1,
           2,
           3,
           {
           name: 'jason',
             addy: '111 fake st'
           },
           function(name){
           	var greeting = 'hello ';
             console.log(greeting + name);
           },
           'hello'
          ];
arr[4](arr[3].name);

// hello jason
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javascript – namespacing, public and private data

This is quick code sample of public and private data using javascript. You would create anonymous call back function. Private data would be store in var.
Public data would be returned.

// we create anonymous callback function to create private and public functions
var THINGS = function() {
// private
var gifts = 3;
// public
return {
    gems: 1000,
    gold: 2000,
    swords: 300,
    SECRET: {
      open: function() {
        gifts--;
        alert('OPENED!');
      }
    }
};}();

I hope you found this code snippet useful in your coding. These are higher order examples of code has to deal with object orientated programming. You can apply these concepts elsewhere.

Public functions can be access and changed anywhere. Where as private can’t be changed the numbers stay static. For example gifts will stay 3, but the public function can subtract it in increments of negative 1.

The reason behind public and private is track bugs. If you have too many public/global variables you get lost quick and other variables can overwrite those current variables, which is something you don’t want. Plus there is name spacing here the namespace is THINGS.

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Javascript – Sales Tax Program

function tax (price, percent) {
		return parseFloat((price*percent/100).toFixed(2));
	}
	var randomItem = 9.85;
	var salesTax = 7.5;
	var total = randomItem + tax(randomItem, salesTax);
	console.log(total);

 

This is a program on how to calculate sales tax with javascript, because handling floats is a bit weird with javascript.

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How to Benchmark Your Javascript?

This is a quick tutorial on how to benchmark your javascript with console.time(“arg”) and console.timeEnd(“arg”)
You would use developer tools to see how fast your script runs.
javascript_benchmark

Example Code:

Array.prototype.proto1 = function(){};
Array.prototype.proto2 = function(){};
Array.prototype.proto3 = function(){};
Array.prototype.proto4 = function(){};
Array.prototype.proto5 = function(){};

var objectLateral = {
  arrayBank: ['Some random string', 'Other String', 'More Stringy Spaghetti']
};

function runThisCode(){
  var things = objectLateral.arrayBank,
      list = "";
	console.time("time");  

  for(var i = 0, ff = things.length; i < ff; i++){
    list += (things[i] + " ");
  }

  console.timeEnd("time");
  return list.trim();
}

runThisCode();
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Returning Functions and Immediate Invocation

// ride and wait time
var parkRides = [["birch bumpers", 40], ["dank bumpers", 36], ["trap bumpers", 41], ["wtf bumpers", 43],];
// fast pass for faster line
var fastPassQueue = ["birch bumpers", "dank bumpers", "trap bumpers", "wtf bumpers"];
// allRides arg - this parameter will be the array of the rides and their wait time
// passrides arg - this will be the array of the nxt available fast pass rides
// pick arg - this will be the actual ride for which our customer would like a ticket!
function buildTicket(allRides, passRides, pick) {
	if(passRides[0] == pick){
		var pass = passRides.shift();
		return function() {alert("Quick! You've got a fast pass to " + pass +"!"); 
	};
	} else {
		for(var i =0; i<allRides.length;i++){
			if(allRides[i][0]==pick){
				return function () {alert("A ticket is print for " + pick +"!\n" + "Your wait time is about " + allRides[i][1] + " minutes.");
				};
			}
		}
	}
}
var wantsRide = "birch bumpers";
// self invoking function when you add () at the end off the function
buildTicket(parkRides, fastPassQueue, wantsRide)();

 

This is hypothetical fast pass system created with functions, arrays, conditional, and for loop statement. All written javascript.

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jQuery – $.each vs $.map jquery

We are going to go over what are the difference between $.each and $.map in jquery. Both are like foreach loops, but utilized differently.

The each method is meant to be an immutable iterator, where as the map method can be used as an iterator, but is really meant to manipulate the supplied array and return a new array.

Another important thing to note is that the each function returns the original array while the mapfunction returns a new array. If you overuse the return value of the map function you can potentially waste a lot of memory.

<script>
    var cities = ['Paris', 'London', 'Orlando'];
    
    $.each(cities, function(index, city){
        var result = city + " " + index;
        console.log(result);
    });
    // paris 0
    // london 1
    // orlando 2

    $.map(cities, function(city, index){
        var result = city + " " + index;
        console.log(result);
        return result;
    });
    // paris 0
    // london 1
    // orlando 2

</script>
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This is Example Code of php Inheritance

This is example code of php inheritance parents and child. extend is the keyword to inherit from the parent class.

 

<?php 

abstract class Shape {

	protected $color;

	public function __construct($color = 'blue')
	{
		$this->color = $color;
	}

	public function getColor()
	{
		return $this->color;
	}

	abstract protected function getArea();
	
}

class Square extends Shape {
	
	protected $length = 4;

	public function getArea()
	{
		return pow($this->length, 2);
	}
}

class Triangle extends Shape {

	protected $base = 4;

	protected $height = 7;

	public function getArea()
	{
		return .5 * $this->base * $this->height;
	}
}

class Circle extends Shape {

	protected $radius = 5;

	public function getArea()
	{
		return M_PI * pow($this->radius, 2);
	}
}

// long hand methods
// $circle = new Circle;

// echo $circle->getArea();

//shorthand
echo (new Circle)->getArea();