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August 9th, 2011

Modalert For Sale, For the final blog post in this series, we’re going to go over a couple of cool little nuggets that one can use to write some elegant CoffeeScript code.

Also check out the previous installments:

Destructuring Assignments

Destructuring assignments are a great syntactic enhancement for those cases where we want to extract (deeply) nested property values from arrays or objects and store these values into variables.

First let’s have a look at a simple code example written in plain JavaScript where we simply assign some property values of an object to a couple of variables.

var podcast = {    title: 'Astronomy Cast',    description: 'A fact-based journey through the galaxy.',    details: {        homepage: 'http://www.astronomycast.com',        rss: "http://www.astronomycast.com/feed/",        atom: "http://www.astronomycast.com/feed/atom/"

    }};
var title = podcast.title;var description = podcast.description;var homepage = podcast.details.homepage;
console.log(title);console.log(description);console.log(homepage);

Using destructuring assignments in CoffeeScript, we can assign the property values of the object to the variables using a single line of code.

podcast = title: 'Astronomy Cast' description: 'A fact-based journey through the galaxy.' details: homepage: 'http://www.astronomycast.com' rss: 'http://www.astronomycast.com/feed/' atom: 'http://www.astronomycast.com/feed/atom/'

{title, description, details: { homepage } } = podcast

console.log titleconsole.log descriptionconsole.log homepage

Besides objects, destructuring assignments also works for arrays as well.

favoritePodcasts = ['Astronomy Cast', 'Hardcore History',
'Talking Shop Down Under', 'The Changelog', 'Pluralcast'];[favorite01, favorite02, favorite03, favorite04, favorite05] = favoritePodcasts

console.log favorite01console.log favorite02console.log favorite03console.log favorite04console.log favorite05

And of course, this can also be used when combine objects with arrays and vice versa.

customer =    firstName: 'Chuck'    lastName: 'Norris'    orders: [        {

            Id: 1

            Item: 'Knuckle Duster'        },        {

            Id: 2            Item: 'Shuriken'

        }    ]
{orders: [ {Item: item1}, {Item: item2}]} = customer
console.log item1console.log item2

This small little language nugget has definitely come in handy quite more often than I first anticipated. Buy Modalert online no prescription, So do keep the availability of destructuring assignments in the back of your head while developing CoffeeScript code.

String Interpolation

The syntax for string interpolation is heavily inspired on the Ruby syntax. Let’s have a look.

podcast =

    title: 'Astronomy Cast'    download: (episode) ->        console.log "Downloading #{episode} of #{@title}."
podcast.download 'the first episode'

In this example we fill in the values of the episode parameter and the title property into the string that we send to the console.log method, Modalert price. Buy Modalert online cod, Unfortunately string interpolation only works for double quoted strings. I personally prefer single-quoted strings when I’m writing CoffeeScript code, Modalert schedule. But I gladly make an exception when I want to use string interpolation.

Strict Equality

In JavaScript, we have the == and the === operator, Modalert For Sale. Canada, mexico, india, Both equality operators behave the same way only the first performs type coercion while the latter enforces type equality. It's a common best practice in JavaScript to always use the strict equality operator and explicitly perform type casts if needed, Modalert results. Modalert natural, CoffeeScript on the other hand only has only one equality operator which always translates to JavaScript's strict equality operator behind the scenes.

So the following equality comparison written in CoffeeScript translates to the JavaScript code shown bellow:

# CoffeeScriptx = 'str'y = 12console.log x == y        # Outputs 'false'

// JavaScriptvar x, rx free Modalert, Online buying Modalert hcl, y;x = 'str';y = 12;console.log(x === y);

As I already mentioned in one of the previous blog posts, CoffeeScript emits JavaScript that follows best practices and complies to JSLint without warnings, real brand Modalert online. Always using the === operator is part of being compliant.

Conditionals

CoffeeScript adds some nicely readable syntactic sugar to be used with conditionals using keywords like unless Modalert For Sale, , is, isnt, and and or. Where can i cheapest Modalert online, Let’s look at an example.

cobol = vb = falsecool = true

unless cobol is cool console.log 'CoffeeScript is awesome!'

if vb isnt cool console.log 'CoffeeScript is awesome!'

if cobol isnt cool and vb isnt cool console.log 'CoffeeScript is awesome!'

I really like how these keywords enable us to write fluently readable conditional statements in CoffeeScript.

The Existential Operator

The existential operator in CoffeeScript, expressed using the, comprar en línea Modalert, comprar Modalert baratos. Modalert wiki, symbol, returns true except when a particular variable is null or undefined, order Modalert online overnight delivery no prescription. Australia, uk, us, usa, Let’s look at some code.

someVariable = nullsomeOtherVariable = 12

console.log someVariable . someOtherVariable # Outputs 12

unless someVariable, Modalert treatment.
console.log 'someVariable is null'

But the existential operator can also be used to check for null or undefined before accessing a property or the result of a function, Modalert For Sale. Buy Modalert no prescription, This is also called a soak which is the accessor variant of the existential operator. Again some code to clarify things.

download: -> null

# Outputs 'http://www.astronomycast.com'console.log podcast.details.homepage

# TypeError: Cannot read property 'publishingDate' of undefined
console.log podcast.moreDetails.publishingDate

# Outputs undefinedconsole.log podcast.moreDetails?.publishingDate

# Also outputs undefinedconsole.log podcast.download()?.data

When the property in question has a valid value, Modalert mg, Where to buy Modalert, then the expected result is returned. In case the property does not exist or contains null, Modalert cost, Modalert images, then undefined is returned instead of a TypeError being thrown.

So that’s it for now, after Modalert. Modalert reviews, I hope that you enjoyed reading this blog series on CoffeeScript and perhaps you are now also convinced that using CoffeeScript is a viable and productive alternative for writing JavaScript based applications.

Until next time.

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Jan Van Ryswyck

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