Code Explainers

Code explainers tagged #undo-redo

php 
final class FormEditorHistory
{
    private SplStack $undoStack;
    private SplStack $redoStack;

Undo/redo with two stacks in PHP

undo-redo stack state-management
Intermediate 9 steps
ruby 
class EditorHistory
  MAX_DEPTH = 100
 
  def initialize(initial = "")

How undo/redo history works in Ruby

undo-redo state-management immutability
Intermediate 9 steps
javascript 
import { useReducer, useCallback } from 'react';
 
function historyReducer(state, action) {
  const { past, present, future } = state;

Undo/redo form state with a React reducer

undo-redo reducer immutability
Intermediate 10 steps
javascript 
class HistoryStack {
  constructor(initial = '', limit = 100) {
    this.past = [];
    this.present = initial;

Building an undo/redo history stack

undo-redo state-management debouncing
Intermediate 7 steps
typescript 
type EditorState = {
  content: string;
  cursor: number;
};

Undo/redo with two stacks in TypeScript

undo-redo stacks state-management
Intermediate 7 steps