49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
|
/*@
|
||
|
|
Ox.filter <f> Filters a collection by a given condition
|
||
|
|
Unlike `Array.prototype.filter`, `Ox.filter` works for arrays, objects and
|
||
|
|
strings.
|
||
|
|
> Ox.filter([2, 1, 0], function(v, i) { return v == i; })
|
||
|
|
[1]
|
||
|
|
> Ox.filter({a: 'c', b: 'b', c: 'a'}, function(v, k) { return v == k; })
|
||
|
|
{b: 'b'}
|
||
|
|
> Ox.filter(' foo bar ', function(v) { return v != ' '; })
|
||
|
|
'foobar'
|
||
|
|
@*/
|
||
|
|
export function filter(collection, iterator, that) {
|
||
|
|
var ret, type = Ox.typeOf(collection);
|
||
|
|
iterator = iterator || Ox.identity;
|
||
|
|
if (type == 'object' || type == 'storage') {
|
||
|
|
ret = {};
|
||
|
|
Ox.forEach(collection, function(value, key) {
|
||
|
|
if (iterator.call(that, value, key, collection)) {
|
||
|
|
ret[key] = value;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
} else {
|
||
|
|
ret = Ox.slice(collection).filter(iterator, that);
|
||
|
|
if (type == 'string') {
|
||
|
|
ret = ret.join('');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*@
|
||
|
|
Ox.indexOf <f> Returns the first index of a collection element that passes a test
|
||
|
|
> Ox.indexOf([1, 2, 3], function(val) { return val % 2 == 0; })
|
||
|
|
1
|
||
|
|
> Ox.indexOf({a: 1, b: 2, c: 3}, function(val) { return val % 2 == 0; })
|
||
|
|
'b'
|
||
|
|
> Ox.indexOf('FooBar', function(val) { return val == val.toUpperCase(); })
|
||
|
|
0
|
||
|
|
> Ox.indexOf([1, 2, 3], function(val) { return val == 0; })
|
||
|
|
-1
|
||
|
|
@*/
|
||
|
|
export function indexOf(collection, test) {
|
||
|
|
var index = Ox.forEach(collection, function(value) {
|
||
|
|
return !test(value); // break if test succeeds
|
||
|
|
});
|
||
|
|
return Ox.isObject(collection) ? Object.keys(collection)[index] || null
|
||
|
|
: index == collection.length ? -1 : index;
|
||
|
|
};
|
||
|
|
|