Question 1:

var each = function(collection, callback) {
  if (Array.isArray(collection)){
    for (var i = 0; i < collection.length; i++) {
      callback(collection[i], i, collection);
    }
  } else if (typeof collection === 'object'){
    for (var key in collection) {
      callback(collection[key], key, collection);
    }
  }else{
    return 'not an array or object';
  }
};

Type of is incorrect should be array.isarray.
Problems with iteartor function does not pass
Needs to have a call back function

Question 2

var addRandomAgeInclusive = function(string, a, b) {
  if(a > b) {
    return string;
  }
  else if (typeof string === "string") {
    var name_object = {};
    name_object['name'] = string;
    name_object['age'] = Math.round(Math.random()*(b-a)+a);
    return name_object
  }
  else if (typeof string === "object") {
    for (var key in string) {
      if (key === "name") {
      string['age'] = Math.round(Math.random()*(b-a)+a);
      }
      else {
        return string;
      }
    }
  }
  return string;
}

addRandomAgeInclusive({ name: 'Sean', id: 10330293 }, 30, 40)