Dead code removal from switch cases in JavaScript

Question

Does any compressor take care of removing the switch cases which do not get called anywhere in the application?

function execute_case(id) {
    switch(id) {
    case 0:
       console.log("0");
       break;
    case 1:
       console.log("1");
       break;
    case 2:
       console.log("2");
       break;
    case 3:
       console.log("3");
       break;
    default:
       console.log("default");
       break;
    }
}

execute_case(1);

If the above is all I have, then theoretically cases 0,2,3 are dead code and will never be executed. Does any compressor have the intelligence of removing this code when minifying code?

I am taking a look at a piece of code which has over 200,000 cases in a switch statement, and hence the question.

Thanks, -Vikrant

Answer 1

No Sir,

As id is a variable, no compressor will "know" that this can not happen. The compressors do not analyze variable values in switch statements and know how to remove them.

If you "know" these cases will not happen, just remove them yourself.