array_map_04.sol

pragma solidity ^0.5.3;

contract Mapping {
    
    mapping(address => uint[]) scores;    
    
    function manipulateArrayMap() external {
        scores[msg.sender].push(1);             //assign a value; 
        scores[msg.sender].push(2);             //assign another element
        
        scores[msg.sender][0];                  //access the element in the map array
        
        scores[msg.sender][1] = 5;              //update an element in the map array in index 1
        
        delete scores[msg.sender][0];           //delete the element in the index 0 of the map array
    }
    
}