| 123456789101112131415161718 | var forIn = require('./forIn');    /**     * return a list of all enumerable properties that have function values     */    function functions(obj){        var keys = [];        forIn(obj, function(val, key){            if (typeof val === 'function'){                keys.push(key);            }        });        return keys.sort();    }    module.exports = functions;
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