select case ... end select

Conditionally execute code, depending on if expression matches tests.

Syntax:

select case condition expression
        case value1
                statements to be executed if value1 match
        case value2
                statements to be executed if value2 match
        {case valueN }
                {statements to be executed if valueN match}
        {case else}
                {statements to be executed if none of previous cases match}
end select

condition expression may be a variable or any expression.
select case statement compare expression with a set of values and execute blocks of commands if match. This command permit to test many possible values without use a long list of if...else instructions, this way, it makes your programs more efficient an readable.

Tests can be strung together with commas:

Case 4, 5, 6

and the forms are:

is = expression in this case you can omit is=
is<> expression
is> expression
is< expression
is<= expression
is>= expression

Example:

' Print the name of a number
select case n
    case is = 1
        print "one"
    case 2 ' omitted is= here
        print "two"
    case 3 ' omitted is= here
        print "three"
    case 4, 5, 6 ' omitted is= here
        print "four, five or six"
    case is < 10
        print "less than 10"
    case else
        print "too big!"
end select