Uninitialized storage pointer in solidity
Working with storage and memory variables can be a bit confusing in solidity. Using a storage variable inside a function can lead to unexpected behaviors.
In this recipe, you will learn to understand the importance of initializing a storage variable while declaring it.
Getting ready
It's expected that you have a basic understanding of the Ethereum blockchain and solidity before stepping through this recipe.
The Remix IDE (https://remix.ethereum.org) can help you quickly test and deploy the contract. Also, you can use any Ethereum client (geth, parity, and so on) and the solc compiler to run this contract.
How to do it...
- Solidity allows you to choose the type of storage with the help of storageandmemory keywords. A storage variable stores values permanently, whereas memory variables are persisted during the lifetime of a transaction.
- Local variables of
struct,array, or mapping type reference storage by default if no explicit specification is given inside...
