Explore blockchain development with Solidity and Next.js. Gain insights into Ethereum dApps, smart contracts, and Web3 integration, enabling you to launch and scale dApps effectively.

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Explore the dynamic world of decentralized applications (dApps) with this course on Solidity and Next.js. You will grasp why developers are keen to learn about blockchain technology and its transformative potential in digital interactions. 

Initially, you will delve into Solidity, the leading language for writing Ethereum smart contracts, understanding its syntax and functionalities using Remix IDE. Then, you’ll transition to integrating your contracts into a web application using Next.js, a powerful React framework that enables server-side rendering and static site generation for faster, scalable dApps. You will sequentially build your application, beginning with smart contract development, setting up your Next.js environment, and linking with Web3 technologies. 

After taking this course, you will be equipped to launch your dApp, potentially unlocking new opportunities in the blockchain space and acting as a gateway to the future of decentralized applications.

Ethereum Blockchain Development with Solidity and Next.js

Solidity is a dynamically typed, object-oriented, high-level language.

**(Select all that apply.)** Which statement is correct?

(Select all that apply.) Which statement is correct?

The source code is _not_ to be compiled with a version of Solidity that is greater than or equal to 0.8.0 but less than 0.9.0.

The file will _not_ compile with a version earlier than 0.8.0.

The source code is to be compiled with a version of Solidity that is greater than or equal to 0.8.0 but less than 0.9.0.

```sol
pragma solidity >=0.8.0 <0.9.0
```
What does this pragma definition mean?

<pre><code class="language-sol">pragma solidity &gt;=0.8.0 &lt;0.9.0
</code></pre>
What does this pragma definition mean?

Which is an example of value data types in Solidity?

Which is an example of value data types in Solidity?

In dynamic arrays, the array can hold items of any length as long as they’re all of the same data type.

`int[5] arrOfIntegers = [1, 2, 3, 4, 5];`

The array above is a dynamic array.

The array member `push(x)` returns nothing.

To remove the last item in a string, we use the function `pop()`.

The most common type in Solidity is `mapping`.

Data stored in memory is permanent and persists between function calls.

Memory is immediately cleared once the function enclosing the variable is called.

The array member functions `push()`, `push(x)`, and `pop()` do _not_ exist on memory arrays.

All reference type arguments used in functions have to be stored in either `memory` or `storage`.

**(Select all that apply.)** Concerning `storage` and `memory`, which statements are _not_ correct?

(Select all that apply.) Concerning <code>storage</code> and <code>memory</code>, which statements are not correct?

```sol
// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract TestContract {
 string[] public fruits;

 function testFunc() public {
 fruits.push("apple");
 fruits.push("banana");

 string[] storage fruits2 = fruits;

 fruits2.push("pineapple");
 }
}
```

When we fetch `fruits` above, what is the value?

<pre><code class="language-sol">// SPDX-License-Identifier: GPL-3.0

pragma solidity &gt;=0.7.0 &lt;0.9.0;

contract TestContract {
 string[] public fruits;

 function testFunc() public {
 fruits.push(&quot;apple&quot;);
 fruits.push(&quot;banana&quot;);

 string[] storage fruits2 = fruits;

 fruits2.push(&quot;pineapple&quot;);
 }
}
</code></pre>
When we fetch <code>fruits</code> above, what is the value?

To check if `valueA` is greater than `valueB`, which operator should be used?

To check if <code>valueA</code> is greater than <code>valueB</code>, which operator should be used?

Test your knowledge on what we've learned so far about Solidity.

Blockchain, Ethereum, and Smart Contracts

Introduction to the Solidity Programming Language

Functions in Solidity

Creating Our Project: The Smart Contract

Create a Decentralized Hiring dApp with Solidity and Next.js

Wrapping Up

Appendix

Decentralized Bank Application Using Solidity Smart Contracts

Quiz: Introduction to Solidity