Function walk

public/javascripts/socket.io.js:2778–2795

(source, property, callback)

	        // `callback` function for each value. This is an implementation of the
	        // `Walk(holder, name)` operation defined in ES 5.1 section 15.12.2.
	        var walk = function (source, property, callback) {
	          var value = source[property], length;
	          if (typeof value == "object" && value) {
	            // `forEach` can't be used to traverse an array in Opera <= 8.54
	            // because its `Object#hasOwnProperty` implementation returns `false`
	            // for array indices (e.g., `![1, 2, 3].hasOwnProperty("0")`).
	            if (getClass.call(value) == arrayClass) {
	              for (length = value.length; length--;) {
	                update(value, length, callback);
	              }
	            } else {
	              forEach(value, function (property) {
	                update(value, property, callback);
	              });
	            }
	          }
	          return callback.call(source, property, value);
	        };

	        // Public: `JSON.parse`. See ES 5.1 section 15.12.2.
	        exports.parse = function (source, callback) {