udacity / bcnd-c6-exercises

4 Exercises for Blockchain Nanodegree Course 6

Blockchain Course 6 Exercises

To install, download or clone the repo, then move to the required exercise branch with either:

• git checkout ExerciseC6A
• git checkout ExerciseC6B
• git checkout ExerciseC6C
• git checkout ExerciseC6D

and for each exercise run:

npm install truffle compile

Develop

To run truffle tests:

truffle test ./test/ExerciseC6A.js or npm test

Resources

• How does Ethereum work anyway?
• Truffle Framework
• Ganache Local Blockchain
• Solidity Language Reference
• Ethereum Blockchain Explorer
• Web3Js Reference
• BIP39 Mnemonic Generator
• Remix Solidity IDE

Versions

This code was created with the following versions of tools:

• Truffle v5.0.1 (core: 5.0.1)
• Solidity v0.5.0 (solc-js)
• Node v8.9.4
• Ganache v1.2.3

Troubleshooting

• Ensure Ganache is running on port 8545
• Ensure Ganache mnemonic is identical to mnemonic in truffle.js
• Ensure you have at least the versions of the tools specified above
• Delete node_modules folder and run "npm install" to refresh dependencies
• If you get compiler errors, change the "pragma" line in all .sol files to match your version
• If you are on Microsoft Windows and get an error message from the operating system that relates to a missing truffle.js file when you type npm test, please rename the truffle.js file to truffle-config.js

bcnd-c6-exercises's Issues

For Exercise C6C: bignumber dependency incorrect in package.json causing test to not run

to resolve the issue:

npm install bignumber.js

For ExerciseC6A: truffle-hdwallet-provider version causes truffle migrate to hang

Please update the package.json file to the latest version of truffle-hdwallet-provider. Update to this:

"truffle-hdwallet-provider": "^1.0.8"

General issue described here: trufflesuite/truffle#1311