Mastering Blockchain Programming with Solidity

Understanding variables' data locations in Solidity

In Solidity, all of the state variables and local variables have a data location specified by default, or you can explicitly define a chosen data location. These data locations are called memory and storage. You can override the default data location by explicitly specifying along with the declaration of the variable. You must define a data location when using complex data types such as arrays, bytes, and structs. Following is the definition for memory and storage:

• Memory: Variables defined with a memory data location are short-lived and not stored on the blockchain. All of the function parameters and return types are by default set to the memory data location.
• Storage: Variables defined ...