Often I have to select some parts of a Hash, like
$H({a: 1, b: "xxx", c: 99}.findAll(function(item) {
return Object.isNumber(item.value);
});
The returned result is an Array of Arrays/Objects,
-> [['a', 1], ['c', 99]] or, equivalently [{key: 'a', value: 1},
{key: ‘c‘, value: 99}]
When working with Hashes I often needed a way to turn these results
into hashes again.
I therefore added a 'hashify' method to the Array class:
(function() {
var hashify = (function(array) {
var hash = $H();
array.each(function(item) {
if (!Object.isUndefined(item.key)) hash.set(item.key,
item.value);
else if (Object.isArray(item) && item.size()>0) hash.set
(item[0], item[1]);
});
return hash;
}).methodize();
Object.extend(Array.prototype, {hashify: hashify, $H: hashify});
})();
With this addition you may write
$H({...}).findAll(function(item) {...}).hashify().get('c'); ->
99
One could also think of adding this behaviour to the Hash constructor,
e.g. for 1.6.1
Object.extend(Hash.prototype, {
initialize: function(object) {
if (Object.isHash(object)) this._object = object.toObject();
else if (Object.isArray(object)) this._object = object.hashify
().toObject();
else this._object = Object.clone(object);
}
});
This way you would be able to write
$H([{key: 'c', value: 99}].get('c'); -> 99
I guess this could be a useful core behaviour, what do you think?
- Julian
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