CoffeeScript lazy singleton class instance function

Explanation

“@instance:” allows us to attach an object/value to the Foo class instead of Foo’s prototype. Recall that “@” in CoffeeScript refers to JavaScript’s “this”.

After “@instance:” there is a function that is immediately executed. This function returns a function, closed around a variable called instance. Both these functions have their context (their “this”) bound to the Foo object using CoffeeScript’s wonderful “define and bind” operator “=>” as opposed to the normal function definition operator “->”.

When called, the function that “@instance” ends up referring to simply checks to see if the “instance” variable is empty and if so, assigns a new instance of Foo to it. Newing up a Foo is done using the “@” symbol since the function’s “this” refers to the Foo object. It then returns the instance.

Output

The CoffeeScript above compiles down to this:

21,099 thoughts on “CoffeeScript lazy singleton class instance function

  1. Window installation is one of those jobs where shortcuts come back to bite you—and your heating bill—all winter long. Common mistakes I see often start with measuring. Folks either measure the rough opening or the existing trim, but not both bedroom window code

  2. Been through my share of web hosting suspensions, and here’s the straight talk: most of these snafus come down to either resource overuse or vague TOS violations. The biggest lifesaver? Always keep a local backup Get more info

  3. Visual aids іn OMT’s curriculum maкe abstract ideas substantial,
    cultivating ɑ deep appreciation fоr mathematics and motivation tߋ overcome tests.

    Founded іn 2013 by Mr. Justin Tan, OMT Math
    Tuition һaѕ assisted numerous students ace exams lie PSLE, Ⲟ-Levels,
    and A-Levels ᴡith proven analytical strategies.

    Ӏn Singapore’s extensive education ѕystem, wherе mathematics
    іs obligatory and consumes around 1600 hours of curriculum
    time in primary school and secondary schools, math tuition еnds up beіng important to assist students
    build ɑ strong structure fⲟr ⅼong-lasting success.

    With PSLE mathematics concerns frequently including real-ԝorld applications,
    tuition supplies targeted practice tߋ develop impߋrtant
    thinking abilities vital fоr higһ ratings.

    Іn Singapore’s affordable education landscape, secondary math tuition ցives the extra ѕide needed to stick
    оut in O Level rankings.

    Building confidence tһrough constant assistance іn junior college math
    tuition minimizes test anxiousness, causing Ƅetter outcomes in A Levels.

    OMT separates іtself vіa а custom curriculum tһat enhances MOE’s ƅy including engaging, real-life circumstances tо boost trainee passion and retention.

    Video explanations are clear аnd intereѕting lor, assisting you grasp commplex concepts ɑnd raise your qualities effortlessly.

    Ӏn a hectic Singapore classroom, math tuition supplies tһe slower, detailed descriptions needed to construct confidence
    f᧐r examinations.

    Heгe іs mү web site: maths tuition primary

  4. 1. Look, I’ve been adding collagen powder to my morning coffee for a couple of weeks now, and honestly, the taste is barely noticeable. Anyone else worried about that weird aftertaste? Also, how long did it take you all to actually see any changes?

    2 more info

  5. I believe that is among the most vital information for me.
    And i am satisfied reading your article. But should remark
    on some normal things, The site taste is perfect, the articles is in reality nice : D.
    Good process, cheers

  6. Hey there, I think your site might be having browser compatibility issues.
    When I look at your blog site in Firefox, it looks fine but when opening in Internet Explorer, it has some overlapping.

    I just wanted to give you a quick heads up! Other then that, amazing blog!

  7. Love that you simply recounted place of job lodges. After my analysis, drafting a practical “supports checklist” (undertaking batching, quiet hours, written training) helped me dialogue to HR with out oversharing adhd diagnosis

  8. Fantastic site. Plenty of useful info here. I am sending it to some pals ans also sharing in delicious.
    And naturally, thank you on your effort!

  9. Undeniably believe that which you stated. Your favorite reason seemed to be on the
    net the simplest thing to be aware of. I say
    to you, I definitely get irked while people think about worries that they plainly
    don’t know about. You managed to hit the nail upon the top and defined
    out the whole thing without having side-effects , people could take a signal.
    Will probably be back to get more. Thanks

  10. В этом материале представлены детали, которые хоть и занимательны, но не особенно значимы. Мы рассматриваем моменты, которые трудно назвать важными, но всё же решили включить их для полноты картины.
    Вот – nipslip

  11. excellent submit, very informative. I ponder why the opposite specialists of this sector
    do not understand this. You must proceed your writing.

    I am confident, you’ve a huge readers’ base already!

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>