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Benx Shen

A re-introduction to JavaScript - MDC - 1 views

developer.mozilla.org/..._re-introduction_to_JavaScript

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shared by Benx Shen on 14 Oct 09 - No Cached
  • var name = o && o.getName();
  • var name = otherName || "default";
  • The first argument to apply() is the object that should be treated as 'this'.
  • ...9 more annotations...
  • apply() has a sister function named call, which again lets you set 'this' but takes an expanded argument list as opposed to an array.
  • Closures
  • A closure is the combination of a function and the scope object in which it was created. Closures let you save state - as such, they can often be used in place of objects.
  • An unfortunate side effect of closures is that they make it trivially easy to leak memory in Internet Explorer.
  • The above code sets up the element to turn red when it is clicked. It also creates a memory leak. Why? Because the reference to el is inadvertently caught in the closure created for the anonymous inner function. This creates a circular reference between a JavaScript object (the function) and a native object (el).
  • delete el;
  • var clickHandler = function() { this.style.backgroundColor = 'red'; } (function() { var el = document.getElementById('el'); el.onclick = clickHandler; })();
  • Surprisingly, one trick for breaking circular references introduced by a closure is to add another closure:
  • It's useful to start with an idea of the language's history. JavaScript was created in 1995 by Brendan Eich, an engineer at Netscape, and first released with Netscape 2 early in 1996. It was originally going to be called LiveScript, but was renamed in an ill-fated marketing decision to try to capitalise on the popularity of Sun Microsystem's Java language — despite the two having very little in common. This has been a source of confusion ever since.
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Benx Shen

Functional Javascript - 3 views

osteele.com/...functional

advanced function javascript

shared by Benx Shen on 01 Aug 07 - Cached
  • Benx Shen on 01 Aug 07
     
    到底是在寫程式還是算數學呢！？... 這樣的程式碼是很簡潔啦，如果熟悉的話，寫起來應該也會蠻爽的！
    可是，要是沒有能夠熟悉這些函數背後的意義，是怎麼也看不懂的！

  • yahya_khk21121 on 12 Jul 17
  • Xopple Infotech on 02 Feb 19
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jobopeningindia.blogspot.in/...text-links-in-kerala.html

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  • danadavid on 29 Jun 13
     
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Riya Patle

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shared by Riya Patle on 15 Apr 16 - No Cached
  • Riya Patle on 15 Apr 16
     
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started by yanglily1223 on 22 Sep 14 no follow-up yet
Benx Shen

Javascript Closures - 0 views

jibbering.com/...closures.html

*i_learning* closure javascript programming tutorial

shared by Benx Shen on 15 Oct 07 - Cached
  • Closure A "closure" is an expression (typically a function) that can have free variables together with an environment that binds those variables (that "closes" the expression).
  • Example 2: Associating Functions with Object Instance Methods
Ching Yi Chan

Microsoft PowerToys for Windows XP - 0 views

www.microsoft.com/...Xppowertoys.mspx

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shared by Ching Yi Chan on 04 Jul 08 - Cached
  • Ching Yi Chan on 04 Jul 08
     
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