Keyword Select - leonard-thieu/monkey GitHub Wiki

Marks the start of a conditional Select block.

Syntax

  Select Expression    Case Expression [ , Expression... ]     Statements...   End Select

  Select Expression    Case Expression [ , Expression... ]     Statements...   End

Description

Select marks the start of a conditional block containing multiple Case statements, only one of which will be executed if its expression exactly matches the Select expression. After executing the code in the selected Case block, program flow will exit the entire Select block and continue.

A Select block is closed with End Select or simply End.

A Select block may also contain a single Default statement; that is, a statement which will be executed if none of the Case expressions matches that of the Select expression.

A range of comma-separated values can be handled in a single Case statement to avoid duplication of code; see the examples below.

See also

• Case
• Default
• Statements

Examples

Try changing the value of apples here to see the different results:

Print "Counting apples..."

Local apples:Int = 1

Select apples
    Case 1
        Print "You have one apple!"
    Case 2
        Print "You have two apples!"
    Case 3
        Print "You have three apples!"
End Select

Print "Done counting!"

Here's an example that uses a Default statement to handle unexpected values:

Local bananas:Int = 0

Select bananas
    Case 0
        Print "No bananas? I feel bad for you."
    Case 1
        Print "You have one banana."
    Case 2
        Print "You have two bananas. Nice!"
    Case 3
        Print "You have three bananas! Amazing!"
    Default
        Print "You have too many bananas! Nobody can eat " + bananas + " bananas!"
End

Monkey can also handle multiple values, separated by commas, in a single Case statement:

Local bananas:Int = 2

Select bananas
    Case 0
        Print "No bananas? I feel bad for you."
    Case 1, 2, 3
        Print "You have between one and three bananas. That's reasonable."
    Default
        Print "You have too many bananas! Nobody can eat " + bananas + " bananas!"
End