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Code Exercises

Practice your Web3 development skills with hands-on coding exercises. Write code, run it, and get instant feedback.

JavaScript: Array Operations

Practice array methods by filtering and mapping blockchain data

javascript

Expected output: ETH, BTC, SOL

Hello Solidity

Write a simple Solidity smart contract with a greeting function

solidity

Gas Optimization Challenge

Optimize this Solidity contract to reduce gas costs

solidity