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sub f {$x=shift; return $x*0.1}

(define (f x) (* x 0.1))

function f(x) {return x*0.1}

$ time rhino -e 'function f(x) {return x*0.1}; print(f(34))'
3.4000000000000004
...
real    0m0.240s
user    0m0.292s
sys    0m0.036s

time echo "define f(x) {x*0.1}; print f(34)" | bc
3.4
...
real    0m0.002s
user    0m0.000s
sys    0m0.000s