editFoodItem(foodItem) {
  this.setEditing(true);
  this.setState({
    food:foodItem.food,
    cost:foodItem.cost,
    foodItem: foodItem
  });
}

setEditing(value) {
  if(typeof value !== 'boolean') { throw " This value must either be true or false"}
  this.setState({
    editing: value
  })
}