I'm trying use prototypal inheritance instead of classical one. But I'm
still confused.
I can't complete very very very small tasks, like this one:
Create 10 copies of a object(with a private variant and public functions to
access it) in an array.
I have two way to approach it, first is to use Object#create:
var x=[];
x[0]=(function () {
var a=10;
return {
getA : function getA() {
return a;
},
setA : function setA(b) {
a = b;
}
};
})();
for(var i=1; i<10; i++)
x[i] = Object.create(x[0]);
But all 10 objects' "a"s refer to a single integer. Tragedy.
My second way is call a function which return a object 10 times:
function createX() {
var a=10;
return {
getA : function getA() {
return a;
},
setA : function setA(b) {
a = b;
}
};
}
var x=[];
for(var i=0; i<10; i++)
x[i] = createX();
It works. But every x has its own "getA" and "setA" instance. In contrast to
the former, it costs more memory.
I know it maybe doesn't matter. But knowing prototypal OO can use only one
instance, creating 10 let me regard me as a stupid.
Except the two methods, the only one method I can figure out is... classical
OO.
Is it avoidable?
--
Lai, Yu-Hsuan
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