var forEach = require('../array/forEach');
var slice = require('../array/slice');
var forOwn = require('./forOwn');

    /**
     * Copy missing properties in the obj from the defaults.
     */
    function fillIn(obj, var_defaults){
        forEach(slice(arguments, 1), function(base){
            forOwn(base, function(val, key){
                if (obj[key] == null) {
                    obj[key] = val;
                }
            });
        });
        return obj;
    }

    module.exports = fillIn;