erc20token's Introduction

ERC20 Token

This code is a basic implementation of an ERC20 token. ERC20 is a standard interface for tokens on the Ethereum blockchain. It defines a set of rules that tokens must follow, such as how to transfer them, how to check balances, and so on.

Explanation

    // SPDX-License-Identifier:MIT
    pragma solidity ^0.8.17;

At the beginning we have comments which show information on the license we are using and publishing the code under and also the version of Solidity language we are currently using.

    contract Erc20Token{

This line marks the beginning of the a new contract called Erc20Token.

    string public name;
    string public symbol;
    uint8 public decimals
    uint private totalSupply;

The lines declare some properties of the token:
- name: The name of the token (e.g., "MyToken").
- symbol: A short code representing the token (e.g., "MA").
- decimals: How many decimal places the token takes
- _totalSupply: The total number of tokens.

mapping(address => uint) private balances;
mapping(mapping(address => uint)) private allowed;

These lines declare two "mappings". In simple terms, mappings are like dictionaries in Javascript and many other languages. The enable us associate a value to another.
- balances: Maps address to the amount of tokens they have.
- allowed : Maps addresses to other addresses to other address and the amount of tokens a address is allowed to spend on behalf of another address.

event Transfer(address indexed _from, address indexed _to, uint _value);
event Approval(address indexed _owner, address indexed _spender, uint _value);

These lines declare two events. Events are away to log information on the blockchain.
- Transfer: This event is emitted when tokens are transferred from one address to another.
- Approval: This event is emitted when one address approves another to spend tokens on its behalf.

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