블록을 생성해 보자.

calculateBlockHash 는 굳이 Block안에 안 넣어도 됨 생각 해보면 음 디자인의 관점인듯

import * as CryptoJS from 'crypto-js';

class Block {
  public index: number;
  public hash: string;
  public previousHash: string;
  public data: string;
  public timestamp: number;

  static calculateBlockHash = (
    index: number,
    previousHash: string,
    timestamp: number,
    data: string
  ): string => CryptoJS.SHA256(index + previousHash + timestamp + data).toString();

  constructor(
    index: number,
    hash: string,
    previousHash: string,
    data: string,
    timestamp: number,
  ) {
    this.index = index;
    this.hash = hash;
    this.previousHash = previousHash;
    this.data = data;
    this.timestamp = timestamp;
  }
}

const genesisBlock: Block = new Block(0, 'abc123', '','genesis', 123456);

let blockchain: Block[] = [genesisBlock];

const getBlockchain = (): Block[] => blockchain;
const getLatestBlock = (): Block => blockchain[blockchain.length - 1];
const getNewTimestamp = (): number => Math.round(Date.now() / 1000);

const createNewBlock = (data: string): Block => {
  const previousBlock: Block = getLatestBlock();
  console.log(previousBlock);
  const newIndex: number = previousBlock.index + 1;
  const newTimestamp: number = getNewTimestamp();
  const newHash: string = Block.calculateBlockHash(newIndex, previousBlock.hash, newTimestamp, data);
  return new Block(newIndex, newHash, previousBlock.hash, data, newTimestamp);
};

console.log(createNewBlock("hi"));
console.log(createNewBlock("hello"));
// console.log(getBlockchain());