mapping.sol

pragma solidity ^0.4.0;

contract MappyingContract{
    mapping(uint => uint[])luckyNumbers;
    mapping(address => uint [])addNumbers;
    uint[] numbers; 
        
    constructor() public{
        luckyNumbers[0] = [1,2,3,4];
        luckyNumbers[1] = [1,2,3,5];
        luckyNumbers[2] = [1,2,3,6];
        luckyNumbers[3] = [1,2,3,7];

        
    }
    
    function getLuckyNumbers(uint key)public constant returns(uint[]){
        return luckyNumbers[key];
    }
    
    function addLuckyNumbers()public view returns(uint){
        numbers.length;
    }
    
    function pushTo(uint key, uint val) public returns (uint[]){
        uint [] arr  =luckyNumbers[key];
        arr.push(val);
        luckyNumbers[key] = arr;
        return arr;
    }
}