Lesson 4 - Explain like I'm 5 priceFeed.latestRoundData() and price conversion decimals

[eli5mecoding]

it's a dumb question but I need to understand how things work in a very simple way to understand the rest of code.
Here](https://youtu.be/gyMwXuJrbJQ?t=15202) I didn’t understand the structure below

AggregatorV3Interface public priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
(,int256 price,,,)= priceFeed.latestRoundData();
}

We want to call latestRoundData() from priceFeed.

This returns the followings data:

uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound

I don't understand why we need to put these info inside () , and not just calling the priceFeed.latestRoundData() function so it can return all the data?

Also, I don’t understand why putting (,,,int 256 price) will return only why we asked?

Isn’t doing this, only assigning the value of latestRoundData() to a variable we just created name int 256 price?

Also, at the price conversion, Why getPrice and minimumUSD need to have the same number of decimals?
thanks in advance

[zeroxvee]

Solidity supports multiple variables return. latestRoundData() returns 5 values. Using (,int256 price,,,)= priceFeed.latestRoundData(); and leaving empty commas with spaces we only choose to take the second return, define it as price so we can use it later. That's basically the way to work with this type of returns. https://docs.soliditylang.org/en/latest/control-structures.html#destructuring-assignments-and-returning-multiple-values

If you put (,,,int 256 price) it will give you an error about uint80 not being converted to uint256, because by doing so you are no referring to uint80 answeredInRound , not int256 answer. Yes you right, this is how we assign a part of the return to a new memory variable.

You don't have to use the same number of decimals, but it's easier this way and less room for a mistake.

[alymurtazamemon]

@eli5mecoding please follow this guide next time when you asks a question. How to Ask Question Guide

[krakxn]

I understand your query, but could you reply with a set of specific questions (just questions - I got the context)? So I can be precise with my answers.