Javascript switch

Javascript with a switch and if else structure.
I used it to determine the dart value for each dart.

Example
(javascript)

function calculateValueDart(dart, dartValue)
{
switch (dart)
{
case "DB" :
dartValue = '50'
return dartValue
case "B" :
dartValue = '25'
return dartValue
default :
//can still be D, T or normal etc
var doubleTriple = dart.substr(0,1)
if (doubleTriple == 'D' doubleTriple == 'T')
{
var actValue = dart.substr(1,2)
switch (doubleTriple)
{
case "D":
dartValue = 2 * parseInt(actValue)
return dartValue
case "T":
dartValue = 3 * parseInt(actValue)
return dartValue
}

}
else
{
dartValue = dart
return dartValue
}
} //end switch
}