/* Mutual recursion, is jsish */
function f(num):number { return (num === 0) ? 1 : num - m(f(num - 1)); }
function m(num):number { return (num === 0) ? 0 : num - f(m(num - 1)); }

function range(n=10, start=0, step=1):array {
   var a = Array(n).fill(0);
   for (var i in a) a[i] = start+i*step;
   return a;
}

var a = range(21);
puts(a.map(function (n) { return f(n); }).join(', '));
puts(a.map(function (n) { return m(n); }).join(', '));

/*
=!EXPECTSTART!=
1, 1, 2, 2, 3, 3, 4, 5, 5, 6, 6, 7, 8, 8, 9, 9, 10, 11, 11, 12, 13
0, 0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 8, 9, 9, 10, 11, 11, 12, 12
=!EXPECTEND!=
*/