Mappings

[AAKASHXOTHEWEEKND]

What does this mapping mean ?

//SPDX-License-Identifier:MIT
pragma solidity ^0.8.8;
import "./PriceConveter.sol";
contract FundMe{
    using PriceConverter for uint256;

    address[] public funders;
    mapping(address => uint256) public addressToAmountFunded;

      uint256 minUsd=50*1e18;
    function fund()public payable{
         require(msg.value.getConversionRate()>= minUsd,"Not enough!");
         funders.push(msg.sender);
         //msg.sender gives the address of the person whoever calls the fund function.
         addressToAmountFunded[msg.sender] +=msg.value;
         

[aaankeet]

@AAKASHXOTHEWEEKND its a mapping used to keep track of amount funded by addresses
the mapping gets updated whenever some Externally Owned Account or contract calls the fund function.

[alymurtazamemon]

@AAKASHXOTHEWEEKND Mapping is a data structure which stores data as key/value pair. key can be any allowed data type (you can read in docs which data types are not allowed) and value can also be any data type.

Example;

//Here key is of data type `address` and the value will be of data type `uint256`
mapping(address => uint256) public x;