const weekendOrWeekday = inputDate => {
  const day = inputDate.getDay();

  if (day === 0 || day === 6) {
    return "weekend";
  }
  return "weekday"; // Or, for ternary fans: // return (day === 0 || day === 6) ? 'weekend' : 'weekday';
};

console.log(weekendOrWeekday(new Date()));

const weekendOrWeekday = inputDate => {
  const day = inputDate.getDay();

  return weekendOrWeekday.labels[day] || weekendOrWeekday.labels["default"];
};

weekendOrWeekday.labels = {
  0: "weekend",
  6: "weekend",
  default: "weekday"
};

console.log(weekendOrWeekday(new Date()));

const doubler = input => {
  switch (typeof input) {
    case "number":
      return input + input;

    case "string":
      return input

        .split("")

        .map(letter => letter + letter)

        .join("");

    case "object":
      Object.keys(input).map(key => (input[key] = doubler(input[key])));

      return input;

    case "function":
      input();

      input();
  }
};

console.log(doubler(-10));

console.log(doubler("hey"));

console.log(doubler([5, "hello"]));

console.log(doubler({ a: 5, b: "hello" }));

console.log(
  doubler(function() {
    console.log("call-me");
  })
);

const doubler = input => {
  return doubler.operationsByType[typeof input](input);
};

doubler.operationsByType = {
  number: input => input + input,

  string: input =>
    input

      .split("")

      .map(letter => letter + letter)

      .join(""),

  function: input => {
    input();

    input();
  },

  object: input => {
    Object.keys(input).map(key => (input[key] = doubler(input[key])));

    return input;
  }
};

console.log(doubler(-10));

console.log(doubler("hey"));

console.log(doubler([5, "hello"]));

console.log(doubler({ a: 5, b: "hello" }));

console.log(
  doubler(function() {
    console.log("call-me");
  })
);