EmojiCoin Smart Contract

I thought there were several interesting things I implemented in my EmojiCoin smart contract. Such as nested mapping for each respective emoji as well as using constant logic to effiecently return balance information from the blockchain.

Implementation

The implementation shown only supports 3 emojis, from index 0 to 2. However I will in future add starting amounts for each respective emoji under my own personal wallet. Also note that this smart contract requires an ERC-20 Compatible wallet.

Mapping of a mapping

Originally I tried to do a mapping of an array and the smart contract would not deploy. When I did a mapping of mapping of uint. It worked properly!

Constant return values

Assuming that the function getBalances is a constant function. It would not change based on what logic you do within it. Therefore it's safe to use the constant keyword to reduce gas costs when running this function.