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39. Smart Contract Interaction with Ethers/Viem

Calling view functions and submitting state transactions.

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Reading state is a free `eth_call` (view function). Writing state requires submitting a signed transaction, paying gas, and waiting for block confirmation receipts.

js
const balance = await tokenContract.balanceOf(address);
const tx = await tokenContract.transfer(to, amount);
const receipt = await tx.wait();

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Check your understanding

  1. 1. What is the cost of executing a view / read contract call?

  2. 2. What does tx.wait() return?

  3. 3. How do you preview if a write transaction will revert without spending gas?

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