For simple conditions and small blocks of code, there's not too much wrong with an if/elsif cascade, except perhaps that if all your conditions are integers, especially a contiguous range of integers, it means that you are sometimes testing more conditions than necessary.

For small, contiguous ranges of conditions, I prefer a array-based dispatch table. This can also be coded inline, although having the condition at the end may be seen as a disadvantage:

( 
    sub{ $abc == 1 },
    sub{ $def == 1 },
    sub{ $xyz == 1 },
)[ $x - 1 ]->();
[download]

Somewhat obfuscate, but quite clear and efficient for small contiguous ranges. The absence of a simple 'default' mechanism is a shame.

For discontiguous ranges, a similar arrangment using an anonymous hash can work

${{
    1 => sub{ $abc == 1 },
    3 => sub{ $def == 1 },
    5 => sub{ $xyz == 1 },
}}{ $x }->();
[download]

The biggest problem, besides the obscurity of the construction, is the absence of a simple 'default' mechanism.

Of course they don't have to be inline, and can used a named array or hash, which also gives the possibility for providing for a default.