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37 lines
1.1 KiB
37 lines
1.1 KiB
2 years ago
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# Transfers History
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### Instructions
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- Create a JavaScript file `transfersHistory.js`that exports the function `transfersHistory(address, address)` that takes as parameters the address of a MinimalTokenEvent Smart Contract instance and the address of an user.
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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.
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#### Structure
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```js
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const { ethers } = require("ethers");
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async function transfersHistory(contractAddress, userAddress) {}
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exports.transfersHistory = transfersHistory;
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```
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#### Usage
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```js
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const { transfersHistory } = require("./transfersHistory.sl.js");
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transfersHistory(
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"0x3c44cdddb6a900fa2b585dd299e03d12fa4293bc",
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"0x70997970c51812dc3a010c7d01b50e0d17dc79c8"
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);
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/* expected:
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[50, -25, 200, 30, -230]
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*/
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```
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### Resources
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- [solidity docs](https://docs.soliditylang.org/)
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- [ethers](https://learnxinyminutes.com/docs/solidity/)
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- [web3 : contracts events](https://web3js.readthedocs.io/en/v1.2.11/web3-eth-contract.html#contract-events)
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