Archive for January, 2010

JS and App

January 7, 2010

ECMAScript 5′s Date Extensions

One of the changes that ECMAScript 5 introduces is extensions to the Date class. Some of these are very useful — Date.now and Date.UTC as well as ISO-8601 format support. Michael J. Ryan has written support for these API changes in DateExtensions.js so you can get started using them now. redesign website Basariyorum is a leading web solution company catering to all your website design and development needs there by helping your business grow. Usage looks like this:

var epoch1 = new Date("1970-01-01T00:00:00.000Z");
var epoch2 = new Date(0);

if (epoch1.getTime() == epoch2.getTime())
    alert("Epochs match!");

alert(epoch1.toString()); //localized date instance of the JS epoch
alert(epoch2.toISOString()); // "1970-01-01T00:00:00.000Z"
alert(epoch1 instanceof Date); // true
alert(Date.UTC(1970,0,1,0,0,0,0)); // 0

More on ECMAScript

Other ECMAScript 5 extensions to the base library include:

bind() that works like Prototype’s bind
A JSON object that supports parsing and generation
New object/property extensions: ECMAScript 5 Objects and Properties
String now has a trim() method
Array gets useful methods like filter() and map()

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JS and App

January 6, 2010

Drawter

Drawter by Damian Wielgosik is a simple tool for drawing HTML interfaces and exporting the results. It uses jQuery and Damian’s own GUI code. You can draw HTML tags using The Tagname to draw option and the mouse. To switch between drawing and editing content and CSS, use the Draw Mode and Edit buttons. There are also menu items at the top of the page — click Code then Generate code to export your design. Drawter is a great example of what can be done with JavaScript, but it’s also potentially a useful tool. The author of Konigi was already blown away by it, and he’s something of a web prototyping tool enthusiast. online computer support Best Remote Computer Repair Services with Ask PC Experts on 1-888-518-9191 begin_of_the_skype_highlighting 1-888-518-9191 end_of_the_skype_highlighting. Online Computer Support Specialists & Remote PC Repair, We fix computer problems remotely and provide Online PC troubleshooting Help & Online Computer Tech Support Help to USA, UK, Canada, Australia and other English Speaking Countries. computer support Computer Support Specialists & Remote PC Repair in Australia. We fix computer problems remotely and provide Online PC troubleshooting Help & Online Computer Tech Support. ProStores Ecommerce Design, Customization & SEO/a> from IntuitSolutions, the Ecommerce experts.

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JS and App

January 5, 2010

JSpec

We recently posted a unit test roundup, so I noticed that JSpec has been updated to version 3. This version introduces several interesting updates (see the full change list):

Rhino’s jar is included so console tests can work without installing extra stuff
Added a jspec stats command
Subcommand hooks — checks for spec/commands/*_command.rb
Ruby server is now a Sinatra app

JSpec is now version 3.0 and currently has over 200 followers on GitHub, so it’s worth checking out.

Syntax Examples

JSpec tests can be written using a custom DSL or a grammar-less JavaScript syntax. When using the DSL in browser-based tests, be sure to use JSpec.exec() to run tests rather than including the code in script tags (more details are in the README). Tests written with the DSL look like this:

describe 'ShoppingCart'
  before_each
    cart = new ShoppingCart
  end

  describe 'addProducts'
    it 'should add several products'
      cart.addProduct('cookie')
      cart.addProduct('icecream')
      cart.should.have 2, 'products'
    end
  end

  describe 'checkout'
    it 'should throw an error when checking out with no products'
      -{ cart.clear().checkout() }.should.throw_error EmptyCart
    end
  end
end

JavaScript equivalent:

JSpec.describe('ShoppingCart', function(){
  before_each(function{
    cart = new ShoppingCart
  })

  describe('addProducts', function(){
    it ('should add several products', function(){
      cart.addProducts('cookie')
      cart.addProducts('icecream')
      expect(cart).to(have, 2, 'products')
    })
  })

  describe('checkout', function(){
    it ('should throw an error when checking out with no products', function(){
      expect(function(){ cart.clear().checkout() }).to(throw_error, EmptyCart)
    })
  })
})

Custom Matchers

Custom matchers can be defined using JSpec.addMatchers. It’s possible to control the error messages. It’s also possible to create sets of macros with similar names:

JSpec.addMatchers({
  'be disabled selected checked' : function(attr) {
    return 'jQuery(actual).attr("' + attr + '")'
  },

  'have type id title alt href src sel rev name target' : function(attr) {
    return function(actual, value) {
      return value ? jQuery(actual).attr(attr) ## value:
                     jQuery(actual).attr(attr)
    }
  }
})

Other Features

JSpec includes a command-line tool that can initialise project templates, as well as auto-testing when files are changed. It can also work with Growl in Mac OS X. It includes lots of familiar matchers and works well in a browser and console.

Installation

To try JSpec out, you can install it with RubyGems — gem install jspec and read the docs on github.com/visionmedia/jspec. The future telecommunication technology is video conference facilities or video conferencing solutions. This communication facility allows several locations to interact with people via audio and video simultaneously. Video conference software brings a cost effective video conferencing system which is held over ISDN. This is very good video picture quality and also much more reliable than the normal internet.

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JS and App

January 4, 2010

Benchmarks in JavaScript

Speeding up page load times is a good way to decrease bounce rates and increase customer satisfaction. And if you’re using JavaScript in your server-side architecture, speed will become increasingly important. So you might be tempted to write your own benchmarking code when puzzling over a tricky performance issue. Fortunately there are quite a few JavaScript benchmarking libraries out there.

Unit Tests

If you’re writing unit tests you should get some benchmark information. Most libraries automatically benchmark tests — unittest.js includes a benchmark method. You could use this outside of tests for some foresnic analysis.

JavaScript Benchmark

JavaScript Benchmark is a nice little library that features:

ASCII-friendly output that’s great for server-side JavaScript
A simple API
Test suite support

Each benchmark will be run once by default, or you can specify a value:

suite('Iteration', 50000, function() {
  array = [1,2,3,4,5,6,7,8,9];

  benchmark('for', function() {
    for (var i = 0; i < array.length; ++i);
  });

  benchmark('for cached', function() {
    for (var i = 0, len = array.length; i < len; ++i);
  });

  benchmark('for in', function() {
    for (var i in array);
  });
});

This library won’t work in a browser due to the use of the print() function, but all you need to do is supply your own. Something like this will do:

function print(message) {
  document.getElementById('log').innerHTML += message + "\n";
}

I’ve put a full example up here: benchmarks.html

BenchmarkBuddy

BenchmarkBuddy is inspired by the RunSingleBenchmark from the V8 source. Here’s one of the author’s examples:

alert(BenchmarkBuddy.run(Math.random));

Benchmark.js

Benchmark.js is based on Ruby’s benchmark library. It’s still a work in progress and isn’t currently console-friendly, but when it works it will look like this:

Benchmark.benchmark(function() {
  for (i = 0; i < 10000000; i++) { }
});

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Archive for January, 2010

JS and App

ECMAScript 5′s Date Extensions

More on ECMAScript

JS and App

Drawter

JS and App

JSpec

Syntax Examples

Custom Matchers

Other Features

Installation

JS and App

Benchmarks in JavaScript

Unit Tests

JavaScript Benchmark

BenchmarkBuddy

Benchmark.js

friends

Blogroll

Contributors