Write an app that gives advice about the number of dog toys the user has. It starts like this:
The user fills in the fields, and clicks Show advice. First, the app validates the input data. Make sure that:
- Neither field is empty.
- Neither field contains a negative number.
Show appropriate error messages. For example:
Use the flag pattern so that all applicable error messages show. In this case, after the user clicks OK, another message would appear for dog toys.
If the data is OK, show some advice on the page. Show the advice below the button.
- If there are more dogs than dog toys, show "You don't have enough dog toys! Get some more."
- If there are more dog toys than dogs, show "You have enough dog toys. Good to go!"
- If there the same number of dogs and dog toys, show "You have just enough dog toys, but no extra. Get some spares."
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