UglifyJS2 , -m sort option does not work

Question

I'm trying to minifier a simple javascript code with UglifyJS2 , but also by including the - m sort in the command, the variables are not changed

Mangler , sort options

sort — to assign shorter names to most frequently used variables. This saves a few hundred bytes on jQuery before gzip, but the output is bigger after gzip (and seems to happen for other libraries I tried it on) therefore it's not enabled by default.

This is the command that I use

uglifyjs jsfile.js -m sort -c -o jsfile.min.js

This is the jsfile.js

var ciao_ciao = 10;

ciao_ciao++;

function ciao_come_va(){


}

ciao_come_va();

This is the jsfile.min.js

function ciao_come_va(){}var ciao_ciao=10;ciao_ciao++,ciao_come_va();

As you can see the name of variables and functions is not changed

Answer 1

Your function and variables will not be mangled because they are in the global scope.

If you wrap your code (as below), the function and variables will be mangled.

(function(){

    var ciao_ciao = 10;

    ciao_ciao++;

    function ciao_come_va(){

    }

    ciao_come_va();

})