WASM Ballot Contract

Introduction

In this chapter, we will teach you how to use ink! to write more complex contracts.

We will build a "Ballot" contract which will allow users to add proposals to a ballot and vote on them. The users will be able to register themselves as a voter with a function call and there will be a chair person (owner) of the contract that will oversee the process.

Over the course of this chapter you will learn:

• To build custom structs
• To store custom structs in vectors and hash maps
• To safely get and update the structs in these collections
• To use ink_prelude crate
• To use traits like Clone, Debug, PackedLayout and SpreadLayout