JS Object Defaults 2

gistfile1.js

DEFAULTS = {
    color: "blue",
    border: 0,
    width: '128px',
    height: '128px'
};

function mergeOptions (defaults, options) {
    for (var name in defaults) {
        if (defaults.hasOwnProperty(name)) {
            if (options[name] == null) {
                options[name] = defaults[name];
            }
        }
    }
    return options;
}

function drawElement (options) {
    var options = mergeOptions(DEFAULTS, options);
    console.log(options);
}

drawElement({color: "red"});