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var checkArguments = function(errors) {
    var gotError = false;

    for(var argName in errors) {
        var checks = errors[argName];

        for(var i in checks) {
            var check = checks[i];

            if(check.invariant) {
                console.warn(argName + ' ' + check.error + '.');

                gotError = true;
            }
        })
    }

    return gotError;
}

var getAmount = function() {
    return 42; // just something to test out our doStuff
}

var doStuff = function(from, to) {
    var amount = getAmount();
    var gotError = checkArguments({
        from: [
            {invariant: from < 0, error: 'too small'},
            {invariant: from >= amount, error: 'too big'}
        ],
        to: [
            {invariant: to < 0, error: 'too small'},
            {invariant: to >= amount, error: 'too big'}
        ]
    });

    if(gotError) {
        return; // raise an Exception, return or something
    }

    // ok, we're fine. let's rock
    // ...
    // still rocking :)
}