Data structures · easy

18. Removing from an array

Swap & pop technique.

Implement `removeAt(uint256 i)` on `uint256[] public items` using swap-and-pop.

Required in your answer: items[i] = items[items.length - 1]items.pop()

Compiles with solc in your browser

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Items {
    uint256[] public items;
    function add(uint256 v) external { items.push(v); }
    function removeAt(uint256 i) external {
        // TODO swap with last, then pop
    }
}

Output appears here.

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