name of a global variable to store the result of a function

[Peng Yu]

As shown in the runtime comparison below, I'd like to return values
via a global variable instead via printing to stdout and $() in
certain situations.

Is there a well-accepted convention for the global variable to store the result?

$ cat ./main2.sh
#!/usr/bin/env bash
# vim: set noexpandtab tabstop=2:

function f {
    echo 42
}

function g {
    result=42
}

TIMEFORMAT=%R
time for ((i=0;i<3000;++i)); do
    x=$(f)
done

time for ((i=0;i<3000;++i)); do
    g
    x=$result
done
$ ./main2.sh
4.181
0.048

-- 
Regards,
Peng