LCamel

pragma circom 2.1.2;

include "circomlib/multiplexer.circom";

template PickOne(N) {
    signal input in[N];
    signal input sel;
    signal output out;

    component mux = Multiplexer(1, N);

LCamel

pragma circom 2.1.2;

include "circomlib/multiplexer.circom";

template PickOneFromEachRow(ROWS, COLS) {
    signal input in[ROWS][COLS];
    signal input whichCol[ROWS];
    signal output out[ROWS];

    component selCol[ROWS];

LCamel

pragma circom 2.1.2;

include "circomlib/multiplexer.circom";

// get in[row][column]
template Mux2D(ROWS, COLS) {
    signal input in[ROWS][COLS];
    signal input row;
    signal input column;
    signal output out;

LCamel

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

// HACK: PROTOTYPING ONLY: use "contract" with a fixed address to avoid compiler library settings
contract Poseidon4 {    
    function poseidon(uint256[4] memory) public pure returns (uint256) {}
}
// goerli: after block 8166444
Poseidon4 constant P = Poseidon4(0x3b44AA63Ac599170357dC587880fC30E506612e7);

LCamel

Simulation of add() 10,000,000 items:
For each add() call:
average storage read = 2.33 slots
average storage write = 2.33 slots
average hash call = 0.33 times (PoseidonT5)


lv 19	                   _                       _                       _                       _
lv 18	                   _                       _                       _                       _
lv 17	                   _                       _                       _                       _

LCamel

"use strict";
import { poseidon } from "circomlibjs"; // for off-line computing
//import { groth16 } from "snarkjs";
//import { ethers } from "ethers";


const MAX_LEVELS = 32;
class HashTower {
    constructor(hashInputCount) {
        this.hashInputCount = hashInputCount;

LCamel

Replacing code with CREATE2 and CREATE.

• Repo: https://github.com/LCamel/ethereum-snippets/tree/main/medium_init_create2
• Article: to be published
• Article gist: https://gist.github.com/LCamel/bf0f173f06c6651c192b01bd48c4de74

LCamel

create2.mjs

This script demostrates how to deploy different code at the same address.

• Repo: https://github.com/LCamel/ethereum-snippets/tree/main/medium_init_create2
• Article: to be published
• Article gist: https://gist.github.com/LCamel/97b7be1e36da9c5e914886b135d6769b

LCamel

init.mjs

This script contains a Javascript-embedable EVM assembler and a generic deployer written in assembly.

• Repo: https://github.com/LCamel/ethereum-snippets/tree/main/medium_init_create2
• Article: https://medium.com/taipei-ethereum-meetup/init-f35c7d6aa7a0
• Article gist: https://gist.github.com/LCamel/77a0a03175ca8dd48ec3e17b70cdde36

LCamel

import java.util.Arrays;
import java.util.Random;

public class AAA {
    public static void main(String[] args) {
        boolean[] board = new boolean[25];
        int n = 0;
        int N = 1000000;
        for (int i = 0; i < N; i++) {
            pick(board, 14);