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JavaScript's functional programming helper library.
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define(['./restArguments', './isFunction', './_optimizeCb', './allKeys', './_keyInObj', './_flatten'], function (restArguments, isFunction, _optimizeCb, allKeys, _keyInObj, _flatten) {
// Return a copy of the object only containing the allowed properties.
var pick = restArguments(function(obj, keys) {
var result = {}, iteratee = keys[0];
if (obj == null) return result;
if (isFunction(iteratee)) {
if (keys.length > 1) iteratee = _optimizeCb(iteratee, keys[1]);
keys = allKeys(obj);
} else {
iteratee = _keyInObj;
keys = _flatten(keys, false, false);
obj = Object(obj);
}
for (var i = 0, length = keys.length; i < length; i++) {
var key = keys[i];
var value = obj[key];
if (iteratee(value, key, obj)) result[key] = value;
}
return result;
});
return pick;
});