Create an array of characters from specified range

Question

I read some code where someone did this in Ruby:

puts (\'A\'..\'Z\').to_a.join(\',\')

output:

A,B,C,D,E,F,G,H,I,J,K,L,M,N,O         


        

Answer 1

function range(r, x) {
    var c1 = r.charCodeAt(0)+1, c2 = r.charCodeAt(3), s = r[0];
    if(c1 && c2)while (c1 <= c2) s += (x || "") + String.fromCharCode(c1++);
    return s;
}

range("A--S", ",");