Hi all,
I'm new to the group. I've searched for a topic like this and didn't
find any, so here are my thoughts about Prototype's Hash
implementation.
Reading the API, i saw that whenever you add a key to a Hash, that has
the same name of a already existing property in its prototype, that
property is lost to the new value, obviously. You can see that happen
in the API's example.
I managed to overcome this problem by adding an Associative Array
inside the Hash structure, meaning that the Hash class is just a
façade to the proper structure. Although there is no problem of adding
like "keys", "_each" or anything to this improved Hash, I had to
override some Enumerable methods, and I think that I may have to
overide most of them, didn't check it all, leading to more and more
code for just a simple thing, although I like a lot this simples
thing, hehe.
I don't know if you already thought of that, but here is the code for
apreciation, it functions just like a normal Prototype Hash:
var Hash = Class.create();
Object.extend(Hash, {
toQueryString: function(obj) {
var parts = [];
this.prototype._each.call(obj, function(pair) {
if (!pair.key) return;
if (pair.value && pair.value.constructor == Array) {
var values = pair.value.compact();
if (values.length < 2) pair.value = values.reduce();
else {
key = encodeURIComponent(pair.key);
values.each(function(value) {
value = value != undefined ? encodeURIComponent(value) :
'';
parts.push(key + '=' + encodeURIComponent(value));
});
return;
}
}
if (pair.value == undefined) pair[1] = '';
parts.push(pair.map(encodeURIComponent).join('='));
});
return parts.join('&');
}
});
Object.extend(Hash.prototype, Enumerable);
Object.extend(Hash.prototype, {
hash: [],
initialize: function(obj) {
if(obj)
Object.extend(this.hash, obj);
},
_each: function(iterator) {
for (var key in this.hash) {
var value = this.hash[key];
if (value && value == Array.prototype[key]) continue;
var pair = [key, value];
pair.key = key;
pair.value = value;
iterator(pair);
}
},
keys: function() {
return this.pluck('key');
},
values: function() {
return this.pluck('value');
},
merge: function(hash) {
return $H(hash).inject(this.hash, function(mergedHash, pair) {
mergedHash[pair.key] = pair.value;
return mergedHash;
});
},
remove: function() {
var result;
for(var i = 0, length = arguments.length; i < length; i++) {
var value = this.hash[arguments[i]];
if (value !== undefined){
if (result === undefined) result = value;
else {
if (result.constructor != Array) result = [result];
result.push(value)
}
}
delete this.hash[arguments[i]];
}
return result;
},
toQueryString: function() {
return Hash.toQueryString(this);
},
inspect: function() {
return '#<Hash:{' + this.map(function(pair) {
return pair.map(Object.inspect).join(': ');
}).join(', ') + '}>';
},
put: function(key, value) {
var old = this.hash[key];
this.hash[key] = value;
return old;
},
toArray: function() {
return this.map();
},
collect: function(iterator) {
var results = [];
this._each(function(value, index) {
results.push((iterator || Prototype.K)(value, index));
});
return results;
},
});
Cheers,
Rafael
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