putting_it_together.md

Chapter 11: Putting it Together

In the previous chapter we called the battle function of the wild pokemon contract from the trainer contract.

We handled multiple return values from the battle function using a tuple. Now we will use the tuple variables alter the state of the trainer contract.

As we discussed in previous chapters, if a trainer's pokemon wins a battle with a wild pokemon, the trainer captures the wild pokemon. If the trainer's pokemon loses, trainer gets nothing.

Put it to the test

As we discussed we have 2 conditions based on the battleResult variable. If battleResult is True that means the trainer's pokemon has won, otherwise (in case of False) the trainer's pokemon loses.

1. Create an if/else statement with the condition as battleResult.

2. If battleResult is True

   • Increase the number of matches for the trainer's pokemon by 1 (use += arithmetic operator to keep the code clean). To access the trainer's pokemon, use trainerToPokemon mapping with first key as msg.sender and second key as pokemonIndex.
   • Increase the number of wins for the trainer's pokemon by 1 (use += arithmetic operator to keep the code clean).
   • Create a new variable named newPokemon of type Pokemon and assign its value to a new Pokemon created using the Pokemon struct and use the following paramters:
     • name: newPokemonName
     • dna: newPokemonDNA
     • HP: newPokemonHP
     • matches: 1 (as the wild pokemon just had a match)
     • wins: 0
   • Add this newPokemon to the pokemonList mapping using the key totalPokemonCount.
   • Increase the totalPokemonCount by 1.
   • Add the newPokemon to trainerToPokemon mapping using the first key as msg.sender and the second key as trainerPokemonCount[msg.sender].
   • Increment trainerPokemonCount[msg.sender] by 1 using += arithmetic operator.
   • Fire the NewPokemonCreated event with following parameters: newPokemonName, newPokemonDNA, newPokemonHP.

3. If battleResult is False Increase the number of matches for the trainer's pokemon by 1 (use += arithmetic operator to keep the code clean).

Congratulations 🎉

You have completed the Chapter 2 and the trainers can battle and capture wild pokemons ⚔️

Tweet about it to share your amazing feat!

** Template **

embedded-code

** Solution **

embedded-code-final

** Previous Chapter Solution **

embedded-code-previous