Solidity Basics

State Variables
Certainly! The code snippet provided involves the creation of a Zombie struct, an array to store instances of the Zombie struct, and a function createZombie to add new Zombies to the array in Solidity.

1. Zombie Struct Definition:
A struct in Solidity is a user-defined data structure that can hold multiple variables of different types. In this case, the Zombie struct is defined with two properties:

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struct Zombie {
    string name;
    uint dna;
}
Zombie is defined to have two properties: name (a string) and dna (an unsigned integer).
This structure allows you to create instances of Zombies, each containing a name and a unique DNA.
2. Zombies Array:
An array named zombies is declared to store instances of the Zombie struct:

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Zombie[] public zombies;
zombies is an array that holds instances of the Zombie struct.
The public visibility specifier allows other contracts or external callers to read the data stored in this array.
3. createZombie Function:
The createZombie function is used to create a new Zombie and add it to the zombies array:

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function createZombie(string memory _name, uint _dna) public {
    zombies.push(Zombie(_name, _dna));
}
createZombie is a public function that takes two arguments: _name (a string) and _dna (an unsigned integer).
Inside the function, a new Zombie instance is created using _name and _dna.
This new Zombie instance is added to the zombies array using the push method.
Summary:
The provided code defines a Zombie struct with name and dna properties, an array zombies to hold instances of this struct, and a function createZombie to create new Zombies by specifying their names and DNA and adding them to the zombies array in Solidity.

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