Lesson 4: Remix Fund Me @ Learn Blockchain, Solidity, and Full Stack Web3 Development with JavaScript – 32-Hour Course

[ojaspungalia]

        for(uint256 funderIndex=0; funderIndex<funders.length;funderIndex++)
        {
            //capture the address of the current index 
            address funder= funders[funderIndex];

            //setting the amount to that index =0
            addressToAmountFunded[funder]=0;
        }


                        // ******DID NOT UNDERSTAND****
        //reset the array 
        funders = new address[](0);

Hi, I'm Ojas, in this section, I wasn't able to understand... why did we reset the array funders AGAIN if we already set it to zero in the previous block of code ?

[ojaspungalia]

Thank you so much @abossofmyself for replying,I really appreciate your help. I am posting the query in just a moment.

[RoboCrypter]

@Ojas1911 : Alright this line: funders = new address[](0); means that we are resetting the funders address array.

yeah I just read the whole thing you mentioned in the code but not in the title, so thats why I got confused

[RoboCrypter]

@Ojas1911 : this line : addressToAmountFunded[funder]=0; we are resetting out mapping to zero, not our address array.

[ojaspungalia]

I realise the difference now, thank you so much for the clarification

[RoboCrypter]

@Ojas1911 : So, understand ,
First we resetted our mapping to zero by : addressToAmountFunded[funder]=0;

Then we resetted our funder address array to zero by by giving it a new address array : funders = new address[](0);

Hopefully, It will clear your doubt!

[ojaspungalia]

Yes, the query is cleared. I really appreciate your help. :)

[RoboCrypter]

@Ojas1911 : Great, Kindly mark the answer as answered to close this discussion as answered. ThankYou.

Have a good one!

[othaime-en]

Hey @Ojas1911 one way to create an empty array is using new arrayName[](0) This means that we are creating a new array (new arrayName[]) which has nothing inside it (0).
so in the line

        funders = new address[](0);

we are assigning a new empty array of type address to the funders variable which effectively means that our funders array is reset and empty

[ojaspungalia]

All right ! I see the difference now. Thank you so much.

[ojaspungalia]

@othaime-en and @abossofmyself where did you guys learn web3 development ?

I just started out a few days ago, I'm curious to know your experience in the web3 space.

[othaime-en]

I've learned from a number of resources but this course is excellent for you to start with. Just be consistent with learning from this course and by the time you're finishing it, you'll be well off in your web3 development journey.

[ojaspungalia]

wow ! That's awesome :)

[RoboCrypter]

@Ojas1911 : If you are doing this 32 hour course, Then you are in the right place, and you will get to learn a lot of stuff and get experience with web3 development as well.

So, Good luck and Happy learning!

[othaime-en]

I highly recommend that you finish this course. It's a really great entry point into this space.