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Oliver Jumpertz Profile picture
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5 Jul, 7 tweets, 2 min read
I found some awesome resources that teach you about blockchain technology.

They are short videos explaining blockchain technology to you in simple words.

A thread.
1. Asymmetric encryption

Encryption is one of the foundational building blocks of a blockchain. Knowing what it is and understanding how it works is definitely beneficial.



1/6
2. Zero Knowledge Proof

Blockchains are public databases.

Everyone decides what the truth is, and this video explains to you how it works.



2/6
3. Blockchain

This one covers blockchain technology itself. If you still wonder what it is, definitely worth a watch!



3/6
4. Proof-of-stake (vs. Proof-of-work)

Distributed consensus is a core concept of blockchains.

Proof-of-state is one of the most popular consensus protocols right now. This video explains to you what it actually is and how it works.



4/6
5. Blockchain Applications

If you know what a blockchain is, it's time to learn about what you can actually use one for.



5/6
6. Smart Contracts

Smart contracts are what make most blockchains interesting for many businesses and users.

This video explains to you what a smart contract actually is.



6/6

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More from @oliverjumpertz

Oliver Jumpertz Profile picture
6 Jul
Initially, coming from a class-based React context, I had a hard time understanding hooks.

And the hook I had the hardest time with was useEffect.

Gladly, I understood it, and I now want to show you what useEffect is and how you can use it.

A thread.
0. A quick hook introduction

Hooks were added to React in 16.8 and enable us to write functional components while still using state and other React features like lifecycle methods without a need for classes.

1/15
Some hooks also enable you to set state in functional components.

This doesn't sound like much, but unlike class components, where you had to modify your component's state for React to notice, you need to tell React when something changed in functional components, too.

2/15
Read 16 tweets
Oliver Jumpertz Profile picture
3 Jul
Knowing and understanding the four visibility modifiers of Solidity is a base requirement for any Solidity developer.

These modifiers are:

1. external
2. public
3. internal
4. private

And each has its own use case.

A thread.
1. external

Only functions can be marked external.

External functions are part of the contract interface and can be called from other contracts and transactions.

They can't be called internally.

This leads to external functions being cheaper to execute.

1/14
Arguments of external functions can be directly read from the calldata.

They don't need to be copied over to memory like for public functions.

2/14
Read 15 tweets
Oliver Jumpertz Profile picture
2 Jul
Some of the most important tools beginners in web development should take a look at:

- ESLint
- Prettier
- Babel
- Webpack/Parcel/Snowflake/esbuild
- Mocha/Jest

Let's go over them individually.

A thread.
1. ESLint

ESLint can take care of both code quality and code style.

Code quality covers issues like unused variables.

Code style covers issues like mixing spaces and tabs to indent code.

A good rule of thumb is to use ESLint to check your code quality.

1/9
2. Prettier

Prettier is a code formatter.

It takes care of code style and rewrites your code such that it conforms to your style guide.

Use prettier to take care of your code style while ESLint covers code quality.

2/9
Read 10 tweets
Oliver Jumpertz Profile picture
28 Jun
Okay, what actually is a dApp?

You might hear this term from time to time, and you have perhaps not spent much more thought on it.

But you are definitely missing out on something great, so let me give you an introduction!

A thread.
1. The internet today

Nearly all websites you visit every day are a perfect model of how the internet works today.

Someone creates a service (a website, e.g.), hosts it somewhere, and has it under full control.

1/24
If you own an app, you decide what happens. You store the data. You can often decide what you do with it.

And most importantly: You can prevent certain users from participating if you don't feel like they deserve to be around.

2/24
Read 25 tweets
Oliver Jumpertz Profile picture
23 Jun
I've developed software for over 21 years now, which is way over half of my lifetime, both professionally and as a hobby.

Here are some of the most valuable lessons I learned along the way.

A thread.
1. You will never know everything

Especially at the beginning, I thought I could learn everything, and I thought this for a good portion of my developer career.

But each time I learned something new, a whole new world of other concepts and techniques opened up.

1/47
It may seem tempting to try and learn it all, but it's a never-ending endeavor.

There will always be another library or framework and another cool thing you could also learn.

2/47
Read 49 tweets
Oliver Jumpertz Profile picture
22 Jun
Web 3.0 is the next evolutionary step of the internet and an awesome one, to be honest.

Every web developer, beginner, junior, or senior can and should contribute to it, and it doesn't even take too much effort.

Let's see how. A thread.

1/
If you are still unsure what the term "Web 3" or "Web 3.0" really means, you might want to read this thread first. 👇🏻



2/
1. Why you should care

The Web is inevitably going to evolve. The question is not if but when this is going to happen.

This process won't happen fast or overnight, though. Instead, it will be a slow transition, nearly unnoticeable.

3/
Read 21 tweets

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