Block Object with calculateHash Function

main.js

const SHA256 = require('crypto-js/sha256')

class Block {
    constructor(timestamp, data) {
        this.index = 0;
        this.timestamp = timestamp;
        this.data = data;
        this.previousHash = "0";
        this.hash = this.calculateHash();
        this.nonce = 0;
    }

    calculateHash() {
        return SHA256(this.index + this.previousHash + this.timestamp + this.data + this.nonce).toString();
    }

    mineBlock(difficulty) {

    }
}