Solidity remove element from array

rm-arr-ele.solidity

pragma solidity ^0.5.2;

contract Array {
    uint256[] internal numbers;
    constructor() public {
        numbers.push(1);
        numbers.push(2);
        numbers.push(3);
    }
    
    function add(uint256 i) public {
        numbers.push(i);
    }

    function removeByUnorder(uint256 idx) public {
        if (idx >= numbers.length) {
            return;
        }
        
        if (idx == numbers.length-1) {
            numbers.length--;
            return;
        }
        
        numbers[idx] = numbers[numbers.length-1];
        numbers.length--;
    }
    
    function removeByOrder(uint256 idx) public {
        if (idx >= numbers.length) {
            return;
        }
        for (uint i = idx; i<numbers.length-1; i++){
            numbers[i] = numbers[i+1];
        }
        numbers.length--;
    }
    
    function getNumbers() public view returns (uint256[] memory){
        return numbers;
    }
}