By the way, I would prefer using Ak47 over Object.observe for some
cases (if there isn't a significant performance issue). ak47 is not
only for object properties, it's also for observing variables;
> var birthdate = ak47(new Date("1.1.1990")),
age = ak47(birthdate, today, function(bd, td){
return parseInt( (td - bd) / 31536000000 );
});
> age()
22
It ensures all data structures are observable. And it's fairly simpler
than JavaScript's new accessor and observation APIs.
Here is a use case, assume we have a module like below:
// a.js
var foo = "hello",
bar = hello + " world";
module.exports = {
foo: foo,
bar: bar
};
// b.js
var a = require('./a');
a.foo = "What's up?"
console.log(a.foo); // what's up?
console.log(a.bar); // hello world
When we ignore using classes (or another way to create properties) in
CommonJS modules, we may have two copies of what we export from a
module. One is internal, the other one is external when a client
module overrides the property.
To solve this issue, I was creating properties like below:
var foo = (function(){
var value = undefined;
return function foo(newValue){
if(arguments.length){
value = newValue;
}
return value;
};
}());
And after using this pattern for long time, I came up to the the idea of ak47.
On Mon, Oct 29, 2012 at 5:42 PM, Rick Waldron <[email protected]> wrote:
> Related... v8 just landed support for Object.observe()
>
> -Rick
>
> On Monday, October 29, 2012 at 8:11 PM, Azer Koçulu wrote:
>
> Hi All,
>
> I've created a new JS library for defining properties that can be subscribed
> for updates and can interact with eachother.
>
> Check it here;
>
> https://github.com/azer/ak47
>
> Readme contains many examples. Here is another one:
>
> var user = ak47({ name: 'joe', 'birthdate': 21 });
>
>> user.name()
> "joe"
>> user.name.subscribe(console.log);
>> user.name("mike")
> "mike"
> "mike" "joe"
>
> Defining a new property that observes another(s):
>
>> var greeting = ak47(joe.name, function(name){
> return 'Hello ' + name;
> });
>> greeting()
> "Hello mike"
>> joe.name("joe")
>> greeting()
> "Hello joe"
>
> What do you think?
>
> Azer
>
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