this has so many use cases. Think of a facade of an array (anything
arraylike really) or implementing binding.
On Mon, Nov 7, 2011 at 8:20 AM, Lasse Reichstein
<reichsteinatw...@gmail.com> wrote:
> On Mon, Nov 7, 2011 at 9:01 AM, Jarek Foksa <ja...@kiwi-themes.com> wrote:
>> While reading WebKit Inspector's sources I have stumbled upon syntax
>> that I have not seen before, namely get & set keywords:
>>
>> var editor = {
>> _startLine: 91,
>>
>> get startLine() {
>> console.log('Getting start line');
>> return this._startLine;
>> },
>>
>> set startLine(value) {
>> console.log('Setting start line');
>> this._startLine = value;
>> },
>> }
>
>
> This way of writing getters and setters in object literals was
> introduced in ES5.
>
>> I fail to see what's the point of this syntax. Considering the fact
>> that it's still possible to change the value of editor._startLine
>> without the setter, how is that better than using regular functions
>> like below?
>
> If your object is being used by other code that expects to be able to
> read startLine directly, using getters and setters allows you to have
> side effects attached to reading it, without changing the existing
> code to use getter and setter functions.
>
> Dumb getter and setter functions (those that really just get and set a
> (private) variable) are really a modeling hack in anticipation of
> maybe, possibly, once in the future to have to do something more.
> 99.9% of getters/setters in Java could be made simple properties
> without any problem. In languages with proper get/set attributes
> (e.g., C# and now ECMAScript), you can make properties just
> properties, and use get/set if you ever need something more.
>
> /L
>
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