counter

Using Map Data Structure in Clarity

Demonstrates how to use and interact with "variables" in Clarity by incrementing a 32-bit unsigned integer and an additional Clarity function to retrieve the incremented value.

Know your Contract

The counter.clar contract includes the following functionality.

• count-up function increments the designated "32-bit unsigned integer" for the account holder, and that value is wrapped inside the counters, which is declared as a map data structure in Clarity
• get-count (...) function retrieves the latest count from the counters map for a given account holder

To add new contracts, follow detailed instructions at Add new Contract.

NOTE: To use this example with Clarinet inside Hiro Platform, you can open the terminal session inside VS code by navigating to File -> View -> Terminal.

Test your Contract

• You can manually test your your contracts in the Clarinet console.
• You can programmatically test your contracts with unit tests.