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public/subjects/blockchain/transfers-history/README.md

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Transfers History

Instructions

  • Create a JavaScript file transfersHistory.jsthat exports the function transfersHistory(address, address) that takes as parameters the address of a MinimalTokenEvent Smart Contract instance and the address of an user.

It returns an array with all the transfers from that account, starting from the most recent, positive if it is toward the user, and negative if it is outside.

Structure

const { ethers } = require("ethers");

async function transfersHistory(contractAddress, userAddress) {}
exports.transfersHistory = transfersHistory;

Usage

const { transfersHistory } = require("./transfersHistory.sl.js");

transfersHistory(
  "0x3c44cdddb6a900fa2b585dd299e03d12fa4293bc",
  "0x70997970c51812dc3a010c7d01b50e0d17dc79c8"
);
/* expected:
[50, -25, 200, 30, -230]
*/

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