Code Explainers

Code explainers tagged #rollback

python 
import os
import shutil
import tempfile
from contextlib import contextmanager

Transactional file operations in Python

transactions rollback closures
Intermediate 8 steps
typescript 
import { useState, useCallback } from 'react';
 
type Todo = {
  id: string;

Optimistic UI updates in a React hook

optimistic-updates custom-hooks error-handling
Intermediate 8 steps
rust 
pub struct ScopeGuard<F: FnMut()> {
    rollback: F,
    active: bool,
}

A RAII rollback guard in Rust

raii error-handling closures
Advanced 8 steps
ruby 
module FileResource
  # Opens a file, yields it to the caller, and guarantees the
  # handle is closed even if the block raises an exception.
  def self.open(path, mode = "r")

Guaranteeing cleanup with begin/ensure in Ruby

resource-management exception-safety blocks
Intermediate 8 steps