simple-undo-redo/src/utils.js

Simple undo-redo functionality with branching support for JavaScript applications

// Simple utility functions for undo-redo-js

// Deep copy using JSON (simple and works everywhere)
const deepCopy = (obj) => {
  // Handle special cases that JSON can't handle
  if (obj === undefined) return undefined;
  if (obj === null) return null;
  
  return JSON.parse(JSON.stringify(obj));
};

// Generate unique ID (timestamp + random)
const generateId = () => {
  const time = Date.now().toString(36);
  const random = Math.random().toString(36).substr(2);
  return time + random;
};

// Check if two objects are equal
const isEqual = (obj1, obj2) => {
  return JSON.stringify(obj1) === JSON.stringify(obj2);
};

// Save to localStorage (simple)
const saveToStorage = (key, data) => {
  if (typeof localStorage === 'undefined') return false;
  
  try {
    localStorage.setItem(key, JSON.stringify(data));
    return true;
  } catch (error) {
    return false;
  }
};

// Load from localStorage (simple)
const loadFromStorage = (key) => {
  if (typeof localStorage === 'undefined') return null;
  
  try {
    const saved = localStorage.getItem(key);
    return saved ? JSON.parse(saved) : null;
  } catch (error) {
    return null;
  }
};

module.exports = {
  deepCopy,
  generateId,
  isEqual,
  saveToStorage,
  loadFromStorage
};