Thursday, July 10th, 2008
Code specialization; Namespaces again; Parasitic inheritance
Category: JavaScript
Karl Krukow has a new blog that has some interesting Ajax content. Rather than pick at one, we have a synopsis of a few of his recent posts:
A technique is presented (in terms of examples) which can give performance boosts in certain situations. The technique relies on higher-order functions, and sharing variables in closures.
Namespacing has been generally accepted (in one form or another) as a good thing. In this posting, a pair of functions: 'namespace' and 'using' are presented. The former ensures the existence of a namespace, similar to what is offered in common JavaScript libraries. However, it accepts more general forms of namespace declarations:
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namespace({
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com: {
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trifork: {
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tribook: ['model','view','controller']
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}}});
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The latter function 'using' complements the namespace function. It brings a namespace into scope.
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using(com.trifork.tribook.model).run(function(m) {
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m.Reservation = function(start,end){
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//...
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};
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});
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Parasitic inheritance & instanceof
The object function advocated by Crockford in his work on parasitic inheritance makes a new object which has the input object as it's prototype. However 'instanceof' doesn't work with this function. A technique for combining these two is presented.
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