tokenbalance | Simple Ethereum API to get your ERC20 Token Balance | Cryptocurrency library

Use $denseRank

The print looks like to be the last line of the log (where you just see the number) the other one looks like an internal log from the package, for any change did you used this package?

https://pub.dev/packages/etherscan_api

if yes did you initialized like you can see in the readme?

I write my test in a way that I calculate decimals separately and In assertion, I concatenate decimals zeros with value.

Can you try setting the balance in the child component as a useEffect function?

You can use the below approach,

• $unwind to deconstruct the balances array
• $group by symbol and sum balance and usdvalue
• $addFields to rename _id field to symbol and and remove _id field

These two assert conditions provide a way to prevent integer overflow and underflow.

The max value of uint256 is 2^256-1, which is approx. 10^77. If you want to add two numbers that would result in a value larger that the max value, it would overflow the integer.

Example with smaller values so it's easier to imagine:

Largest value of uint8 is 255. So if you have a value 250 and you want to add 10, it overflows the max value, and becomes 4 (because 255 + 1 equals 0 in case of uint8).

The same goes the other way around. You have a value 5 and want to subtract 10. Since it's an unsigned integer, there's no negative numbers, and it underflows and becomes 251 (because 5 - 5 is 0, and then the remaining 5 is subtracted from the "max value + 1").

You can find more info about the integer overflow/underflow vulnerability in the SWC registry: https://swcregistry.io/docs/SWC-101

FIXED :D

I found a solution, I don't know if it is the most elegant or the most efficient, but it is better than being tied to a database structure, and better than doing several queries with SUM in the database.

I made a vaultquery of FungibleToken with the externalIds of the desired accounts. This query returns all states / tokens of the requested accounts, I worked on the answer.

I grouped each state / token by the holder, retrieving the accountInfo by holder.owningKey and increasing the amount.quantity. That is, I did the sum manually.

I believe it is a simple solution that does what I need.

I would suggest you to take look at the Token Sample at here. This sample simply walks through the steps of the create, issue, and transfer.

If you do not have any dvp action in your design. I would not suggest you to look at the worldcupticketbooking sample where the dvp makes the flow super complicated.

I would actually suggest you to look at the tic-tac-thor sample to get familiar with the account flow logic. Then try to mimic your design from the worldcupticketbooking sample.