best practice looping through javascript object

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Access / process (nested) objects, arrays or JSON 18 answers

For-each over an array in JavaScript? 23 answers

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You can do a test like this

function representsNumber(str) {
    return str === (+str).toString();
}

// e.g. usage
representsNumber('a'); // false
representsNumber([]); // false
representsNumber(1); // false (it IS a number)
representsNumber('1.5'); // true
representsNumber('-5.1'); // true
representsNumber('NaN'); // true

And recurse over all your nodes, overkill example

function seeker(o, test, _true, _false) {
    _true || (_true = function (e) {return e;});
    _false || (_false = function (e) {return e;});
    function recursor(o) {
        var k;
        if (o instanceof Array)
            for (k = 0; k < o.length; ++k) // iterate over array
                if (typeof o[k] !== 'object')
                    o[k] = test(o[k]) ? _true(o[k]) : _false(o[k]);
                else
                    recursor(o[k]);
        else
            for (k in o) // iterate over object
                if (typeof o[k] !== 'object')
                    o[k] = test(o[k]) ? _true(o[k]) : _false(o[k]);
                else
                    recursor(o[k]);
    }
    if (typeof o === "object") return recursor(o), o;
    else return test(o) ? _true(o) : _false(o); // not an object, just transform
}

// e.g. usage
seeker({foo: [{bar: "20"}]}, representsNumber, parseFloat);
// {foo: [{bar: 20}]}

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