That's almost exactly the polyfill for Object.create (except with some
extra book keeping):
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/create
|if| |(!Object.create) {|
|||Object.create = ||function| |(o) {|
|||if| |(arguments.length > 1) {|
|||throw| |new| |Error(||'Object.create implementation only accepts the
first parameter.'||);|
|||}|
|||function| |F() {}|
|||F.prototype = o;|
|||return| |new| |F();|
|||};|
|}
// classic inheritance works from Object.create without any glue code at all
ChildClass.prototype = Object.create( ParentClass.prototype );
|
You could rewrite the base.js version slightly, to take advantage of
Object.create (if there's an advantage the native method), and still do
the bookkeeping:
||
|apache.extend = function( child, parent ) {
child.$super$ = parent.prototype;
child.prototype = Object.create( parent.prototype );
child.prototype.constructor = parent;
}|
|// fallback to base.js method if Object.create polyfill is undesired|
|if| |(!Object.create) {
apache.extend = ||function( child, parent ) {
function F() {};
F.prototype = parent.prototype;
child.$super$ = parent.prototype;
child.prototype = new F();
child.prototype.constructor = child;
};
}
|
Object.create has other useful features too (that can't be polyfilled
unfortunately) - it has a way to set properties enumerable,
configurable, and writable and to define getters and setters. Having a
mode to output to that might be pretty spiffy.
Kevin N.
