underscore_pickDeep.js
977bc1d229f2master

underscore_pickDeep.js
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			_.mixin({
			/**
			* Return a copy of the object only containing the whitelisted properties.
			* Nested properties are concatenated with dots (e.g. "property.value").
			*
			* Example:
			* a = {a:'a', b:{c:'c', d:'d', e:'e'}};
			* _.pickDeep(a, 'b.c','b.d')
			*
			* Returs:
			* {b:{c:'c',d:'d'}}
			*
			* @param obj
			* @returns {{}}
			*/
			pickDeep: function(obj) {
			var copy = {},
			keys = Array.prototype.concat.apply(Array.prototype, Array.prototype.slice.call(arguments, 1));

			this.each(keys, function(key) {
			var subKeys = key.split('.');
			key = subKeys.shift();

			if (key in obj) {
			// pick nested properties
			if(subKeys.length>0) {
			// extend property (if defined before)
			if(copy[key]) {
			_.extend(copy[key], _.pickDeep(obj[key], subKeys.join('.')));
			}
			else {
			copy[key] = _.pickDeep(obj[key], subKeys.join('.'));
			}
			}
			else {
			copy[key] = obj[key];
			}
			}
			});

			return copy;
			}
			});