How can I shorten it to a small function?

I have a simple function that does the conversions, but I know there is a better way to do it besides using a bunch of otherwise if statements. How I shorten it?

private function doConversions(value:int):void
    {
        if (selectedFromSpinner == "acres" &&  selectedToSpinner == "hectares")
        {
            txtOutput.text = (value * 0.404686).toString();
        }
        else if (selectedFromSpinner == "hectares" &&  selectedToSpinner == "acres")
        {
            txtOutput.text = (value * 2.47105381).toString();
        }
        else if (selectedFromSpinner == "ares" &&  selectedToSpinner == "acres")
        {
            txtOutput.text = (value * 0.0247105381).toString();
        }
        else if (selectedFromSpinner == "acres" &&  selectedToSpinner == "ares")
        {
            txtOutput.text = (value * 40.4685642).toString();
        }
}

Thank you

You could probably make a little shorter with the help of a dictionary, but it would be probably slower.

Basically, you'd do a table of implementation "" elements, each of which contains a table of "to the" elements, each having a multiplication factor. Then for each conversion, just look up the correct entries.

You might speed it up by using integers instead of research/string comparisons.

Alternatively, standardize to a single device: first convert everything in m2, and then convert the m2 in everything. That would make it much easier to maintain your code. Off the top of my head and not verified:

// on app initialization:
var toM2:Array = [];
toM2['acres'] = somefactor;
toM2['hectares'] = someotherfactor;
// etc

// for conversion:
var m2:Number = value * toM2[selectedFromSpinner]; // convert to m2
txtOutput.text = m2 * (1/toM2[selectedToSpinner]); // convert from m2

Tags: BlackBerry Developers

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