Combining arrays for use cases

Question

Node.js app, writing validation tests. Given the following:

var obj = { foo: null, bar: null, baz: null},
    values = [ 0, 1];

I need to

Answer 1

This is a non-recursive version of what you want:

function createRange(keys, values) {
  if (typeof values[0] !== typeof [])
    values = keys.map(k => values);
  var pointer = {};
  var repeats = 1;
  keys.forEach((k, i) => {
    var vLen = values[i].length;
    repeats *= vLen;
    pointer[k] = {
      get value() {
          return values[i][pointer[k].current]
        },
        current: 0,
        period: Math.pow(vLen, i),
        inc: function() {
          var ptr = pointer[k];
          ptr.current++;
          if (ptr.current < vLen) return;

          ptr.current = 0;
          if (i + 1 === keys.length) return;

          var nk = keys[i + 1];
          pointer[nk].inc()
        }
    };
  });
  var result = [];
  for (var i = 0; i < repeats; i++) {
    var o = {};
    result.push(o);
    keys.forEach(k => o[k] = pointer[k].value)
    pointer[keys[0]].inc();
  }
  return result;
}

var objKeys = ['u', 'v', 'w', 'x', 'y', 'z'];
var objValues = [
  ['1', '2', '3'],
  ['a', 'b', 'c'],
  ['foo', 'bar', 'baz'],
  [1, 3, 2],
  ['test', 'try', 'catch'],
  ['Hello', 'World'],
];

var range = createRange(objKeys, objValues);
range.map(v => document.write(JSON.stringify(v).big()))