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Multiple functions can exist in the same source file.

function concat ( value1, value2 )
{
    return value1 + value2 ;
}

function startDate ( type )
{
    if ( type == 'A' )
    {
        return "30-1-2006" ;
    }

    return "23-4-2005" ;
}

JavaScript is a loosely typed language.

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There are several JavaScript functions such as parseFloat, parserInt and the Number object that can be used to convert String values to number values. Also number variables have several built-in functions such as toFixed and toPrecision that allow formatted values to be returned.

value = Number ( value )
value = parseInt ( value )
value = parseFloat ( value )

The following example illustrates these functions.

function changeit ( value )
{
    value = Number ( value ) ;

    if ( value > 100 )
    {
        value = value - 100 ;
    }

    return value.toFixed ( 2 ) ;
}