Sum digits of an integer

func Σ(String str, base=36) {
    str.chars.map{ Num(_, base) }.sum
}
 
<1 1234 1020304 fe f0e DEADBEEF>.each { |n|
    say "Σ(#{n}) = #{Σ(n)}"
}

Output:

Σ(1) = 1
Σ(1234) = 10
Σ(1020304) = 10
Σ(fe) = 29
Σ(f0e) = 29
Σ(DEADBEEF) = 104