Switch statements

CJam doesn't have switch statements. Nested if statements work just as well, but {{}{}?}{}? is already 12 bytes long...

If we can transform the condition into a small, non-negative integer, we can transform all case statements in a delimited string and evaluate the corresponding result.

For example, if we want to execute code0 if the integer of the stack is 0, code1 if it is 1, and code2 if it is 2, we can either use

_{({code2}{code1}?}{;code0}?

or

[{code0}{code1}{code2}]=~

or

"code0 code1 code2"S/=~

S/ splits the string into ["code0" "code1" "code2"], = extracts the corresponding chunk, and ~ evaluates the code.

Click here to see switch statements in action.

Finally, as suggested by suggested by @jimmy23013 and @RetoKoradi, we can shorten the switch even more in some cases. Say code0, code1 and code2 have lengths L₀, L₁ and L₂, respectively.

If L₀ = L₁ ≥ L₂

"code0code1code2"L/=~

can be used instead, where L is L₀. Instead of splitting at a delimiter, / splits the string into chunks of equal length here.

If L₀ ≥ L₁ ≥ L₂ ≥ L₀ - 1,

"cccooodddeee012">3%~

can be used instead. > removes 0, 1 or 2 elements from the beginning of the string, and 3% extracts every third element (starting with the first).