On Mar 23, 2011, at 6:43 AM, Poetro wrote:
2011/3/23 pnbv <[email protected]>:
Considering a single instance object:
app = {
foo: 'afoo',
bar: 'abar',
callbackLib: {
replyFoo: function () {
console.log(this.foo);
},
replyBar: function () {
console.log(app.bar);
}
},
doSomeThing: function (){
this.callbackLib.replyFoo.call(this);
this.callbackLib.replyBar();
}
}
app.doSomeThing();
What would be the preferred way of doing this (if there really is a
need for nested objects:)?
Thanks,
pedro
If you just want to get rid of the reference to this, you could do:
app = {
foo: 'afoo',
bar: 'abar',
callbackLib: {
replyFoo: function () {
console.log(app.foo);
},
replyBar: function () {
console.log(app.bar);
}
},
doSomeThing: function (){
app.callbackLib.replyFoo();
app.callbackLib.replyBar();
}
}
app.doSomeThing();
Although this would trigger errors in the following case:
bar = app;
app = {};
bar.doSomeThing();
As app is now no more.
There's a failure case either way.
var doSomething = app.doSomething;
doSomething(); // boom if the 'this' references are left in tact.
I find it preferable for non-instance collections of functions (i.e.
object literals with methods as shown) to reference the object rather
than 'this' as they are often utility functions or apply to the
application as a whole, and are therefore more useful as function refs
that can be passed around or assigned to shortcut vars. Shortcut vars
can be compressed better as well.
Short form: use 'this' in prototype methods, the containing var name
in "static" methods. As with most things, this is a guide, not a rule.
L
--
Poetro
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