lesson-9 testing Question

[TimeKeyRoll]

Can someone explain me this green line ..how deployer is equal to playerfromcontract?
if we mentioning playerfromcontract value is 0 then how come its equal to deployer?

any easy explanation would be helpful.

[othaime-en]

@MasterofBlockchain on line 37, playerFromContract is assigned to lottery.GetPlayer(0) If you look at the contract code, the function GetPlayer(0) returns the player that joined the lottery (at index 0). In this case, on line 35, you joined the lottery with the deployer account. Which means that the s_players array already contrains one player: The deployer. So calling the getPlayer(0) function should return the deployer account assigned to playerFromContract. Therefore that is why we check if playerFromContract is similar to deployer to make sure that indeed the right account got stored in the players array

[TimeKeyRoll]

Okay!Cool. Just want to know your opinion about lesson-10. I am more interested in block-end. so skipping lesson-10 is fine? or does it also contains some kinda block-end which is essential to learn to be a block-end developer?
Because I have zero knowledge of front-end and I thought to keep my focus first on block-end. So what do you think/recommend? So Skipping L-10 is okay? and is there anything else in this course i could skip because mainly want to focus on backend. :)

[othaime-en]

I'm also interested in block-end so I skipped the lesson too lol. Plus the learning curve for lesson 10 is a bit steep. You need to have some basic solid knowledge about frontend frameworks like Next.js to be able to understand most of the stuff there. It is totally fine to skip it. It doesn't contain extra knowledge about block-end stuff. Feel free to go to Lesson 11 :)

[TimeKeyRoll]

Perfect!:)
Btw How about L-15 it seems a front end too?

did you finish this lesson and how you dealt with frontend there?lol

[othaime-en]

Lesson 15 has three sections 1 for backend and 2 for frontend. I'd advice you do the backend section. You'll learn some new concepts there about how some protocols and common web3 services like opensea work in the background. Afterwards, you could skip the frontend part.

[TimeKeyRoll]

Thanks Mate! You are a True Gem.

[RoboCrypter]

@MasterofBlockchain : Let me clear your question in layman language :

In background our contract is running and we need to mimic all the steps and input parameters of our function in order to execute the test successfully :

e.g : function EnterLottery(uint256 entranceFee) : You have to put the entranceFee because its the input parameter of this function.

So,
Your query is in this it statement : it("record players when they enter")

Now, In order to record the player you need to enter in the lottery first.

So, In your it statement first line is : await lottery.EnterLottery() So, lets just do this without the input parameter entranceFee.

Now, If you run your assert statement : assert.equal(PlayerFromContract, deployer) What will happen ? It will fail!

You know why ? Because PlayerFromContract didn't enter the lottery, because he didn't pay the required entranceFee to the contract.

So, He will not be recorded in GetPlayers array,

const PlayerFromContract = await lottery.GetPlayer(0)
console.log(PlayerFromContract)

There will be no one there!

Now, Lets pay the required entranceFee as an input parameter when entering the lottery :

await lottery.EnterLottery({ value: entranceFee })

So, now the PlayerFromContract did actually paid the required entranceFee to the contract, He will now be recorded in GetPlayers array,

So, you can check it by :

const PlayerFromContract = await lottery.GetPlayer(0)
console.log(PlayerFromContract)

And you will get your deployer address!

After that when you run you assert statement : assert.equal(PlayerFromContract, deployer) It will return true

That's why we needed entranceFee input parameter for our function EnterLottery in our tests!

Hopefully, This explanation will clear your doubt!

[TimeKeyRoll]

thankyou so much for the explanation. Wonderful Job. Indeed.