Log for YSITD

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var val = [0, 1, 2, 3]
var map = new Map();
map.set(val.join('|'), true)
var gen = [val];
var nextGen = null;
var iter = 0;

while (gen.length) {
  nextGen  = [];
  for (var i = 0; i < gen.length; i++) {
    var original = gen[i]
    for (var j = 0; j < original.length - 1; j++) {
      var newI = original.slice(0);
      [newI[j], newI[j+1]] = [newI[j+1], newI[j]];

      if (map.has(newI.join('|'))) {
        continue;
      }
      
      map.set(newI.join('|'), true);
      nextGen.push(newI)
    }
  }
  console.log(nextGen);
  gen = nextGen;
  iter++;
}

console.log(iter - 1, Array.from(map))