numdot 解答

count_up.js

var result = "",
    l = [0,0,0,0,0],
    i = 0,
    f;
function carry (l) {
  if (l.length <= 1) {
    return l;
  }
  var f = l.slice(1).some(function(v) {
    return v == l[0] || v == l[0] - 1
  });
  var m = Math.max.apply(null, l.slice(1));
  if (f == false) {
    l[0] = 0;
    l[1]++;
  }
  return l.slice(0,1).concat(carry(l.slice(1)));
}
function tostr(l) {
  var l2 = l.slice().reverse();
  var results = ["", "", "", "", ""];
  l2.map(function(v, i) {results[v] += (i+1)});
  return results.join('.').replace(/\.*$/, '');
}
while (l[0]<4) {
  console.log(tostr(l));
  l[0]++;
  l = carry(l);
}
console.log(tostr(l));

indexOf.js

https://gist.github.com/poochin/6681807

numdot_insert_list.js

var l = [[[1]]], l2, l3, i, j, k;

function copy_r(list) {
  return list.map(function(v){
    if (v.map) {
      return copy_r(v);
    }
    return v;
  });
}

for (i = 2; i <= 5; ++i) {
  l2 = [];
  for (j = 0; j < l.length; ++j) {
    l3 = [];
    for (k = 0; k < l[j].length; ++k) {
      l3 = copy_r(l[j]);
      l3[k].push(i);
      l2.push(l3);
    }
    l3 = copy_r(l[j]);
    l3.push([i]);
    l2.push(l3);
  }
  l = l2;
}

for (i = 0; i < l.length; ++i) {
  console.log(l[i].map(function(v){return v.join('')}).join('.'));
}