JavaScript equivalent of jQuery’s extend method

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To get the result in your code, you would do:

function extend(a, b){
    for(var key in b)
        if(b.hasOwnProperty(key))
            a[key] = b[key];
    return a;
}

Keep in mind that the way you used extend there will modify the default object. If you don’t want that, use

$.extend({}, default, config)

A more robust solution that mimics jQuery’s functionality would be as follows:

function extend(){
    for(var i=1; i<arguments.length; i++)
        for(var key in arguments[i])
            if(arguments[i].hasOwnProperty(key))
                arguments[0][key] = arguments[i][key];
    return arguments[0];
}

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