/* Flatten list, in Jsish */
function flatten(list) {
  return list.reduce(function (acc, val) {
    return acc.concat(typeof val === "array" ? flatten(val) : val);
  }, []);
}

if (Interp.conf('unitTest')) {
;   flatten([[1], 2, [[3, 4], 5], [[[]]], [[[6]]], 7, 8, []]);
}

/*
=!EXPECTSTART!=
flatten([[1], 2, [[3, 4], 5], [[[]]], [[[6]]], 7, 8, []]) ==> [ 1, 2, 3, 4, 5, 6, 7, 8 ]
=!EXPECTEND!=
*/