Sometimes you can believe the right thing for the wrong reason.

This is why I despise “where’s Waldo” and “colored balls for a color-blind person” analogies for ZK.

I’m not aware of any real shortcut to providing a correct intuition for what ZK actually does under the hood.

DeFi

Which DeFi project has the best order-book DEX? I mean actual order book, not AMM.

An immutable variable in solidity can be indexed bytewise.

For example:

```
uint256 immutable x;

// …

bytes1 y = x[0];
```

You can simulate immutable strings (up to 32 bytes) this way.

Base

Check if a number is even or odd in Solidity:

Don’t do `n % 2 == 0`

Do `n & uint256(1) == 0`

If the final bit is zero, then the number is even. The second method is cheaper.

Jobs

I’m hiring a senior technical writer. Please see the job application here:

I’m hiring a senior technical writer. Please see the job application here:

https://cryptocurrencyjobs.co/engineering/rareskills-senior-technical-writer/

Ethereum

Throwback to my first article series on Solidity / Web3: how to save gas on NFT mints:

Over 2 years old but still very relevant, and has inspired dozens of similar articles since.

Throwback to my first article series on Solidity / Web3: how to save gas on NFT mints:

Over 2 years old but still very relevant, and has inspired dozens of similar articles since.

https://medium.com/donkeverse/hardcore-gas-savings-in-nft-minting-part-1-16c66a88c56a?sk=da05a13b9dafb07f0103c65ed45440ca

Jeffrey Scholz

@jeffs