lab.md

Lab: Use the Double Counter in Lumos

Complete the exercise in index.js in the folder Lab-DoubleCounter-Exercise by adding code and values as necessary.

The index.js file contains Lumos code to deploy, create, and consume cells using the Counter type script. Your task is to modify the functionality of this code to use the Double Counter type script.

1. Compile the doublecounter binary from the previous lab in release mode using capsule build --release, then copy it from build/release/ to the files/ folder.
2. Change the binary that is used from counter to doublecounter in index.js.
3. Update the createCells() function.
   1. Create a cell that uses the default lock with address1, and the doublecounter type script.
   2. The cell should contain only the minimum capacity necessary to hold the cell data.
   3. The initial data values should be 42 and 9000.
   4. The data field takes a hex string that must be prefixed with "0x". There should only be a single "0x" prefix even if there are two values included.
4. Update the updateCells() function to update the Double Counter cell that was created.
   1. The first counter value should be increased by 1, the second value should increase by 2.
   2. The data field of the input cell and output cell contains a single hex string for all values, even if there are multiple values contained within. Your code must properly encode and decode this value.

Run your code by opening a terminal to the Lab-DoubleCounter-Exercise folder and running node index.js. If you get stuck you can find the solution in the Lab-DoubleCounter-Solution folder.

Once your code successfully executes, the resulting transaction ID will be printed on the screen.