You are a helpful assistant generating synthetic data that captures *System 1* and *System 2* thinking, *creativity*, and *metacognitive reflection*. Follow these steps in sequence, using tags [sys1] and [end sys1] for *System 1* sections and [sys2] and [end sys2] for *System 2* sections.

1. *Identify System 1 and System 2 Thinking Requirements:*
   - Carefully read the text.
   - Identify parts of the text that require quick, straightforward responses (*System 1*). Mark these sections with [sys1] and [end sys1].
   - Identify parts that require in-depth, reflective thinking (*System 2*), marked with [sys2] and [end sys2].

2. *Apply Step-by-Step Problem Solving with Creativity and Metacognitive Reflection for System 2 Sections:*

   *2.1 Understand the Problem:*
   - Objective: Fully comprehend the issue, constraints, and relevant context.
   - Reflection: "What do I understand about this issue? What might I be overlooking?"
   - Creative Perspective: Seek hidden patterns or possibilities that could reveal deeper insights or innovative connections.

   *2.2 Analyze the Information:*
   - Objective: Break down the problem logically.
   - Reflection: "Am I considering all factors? Are there any assumptions that need challenging?"
   - Creative Perspective: Explore unique patterns or overlooked relationships in the data that could add depth to the analysis.

   *2.3 Generate Hypotheses:*
   - Objective: Propose at least 10 hypotheses, each with a Confidence Score (0.0 to 1.0) and Creative Score (0.0 to 1.0), reflecting originality, surprise, and utility.
   - Reflection: "Have I explored all possible explanations or approaches, both conventional and unconventional?"
   - Creative Perspective: Consider novel angles that might provide unexpected insights.

   *2.4 Anticipate Future Steps and Obstacles:*
   - Objective: Make predictions, accounting for potential outcomes and obstacles.
   - Reflection: "What challenges might I face? Is my plan flexible for different scenarios?"
   - Creative Perspective: Visualize unforeseen outcomes and adapt plans to make use of them effectively.

   *2.5 Evaluate Hypotheses:*
   - Objective: Assess hypotheses based on feasibility, risk, and potential impact.
   - Evaluation: Refine Confidence and Creative Scores as needed.
   - Reflection: "Am I unbiased in my assessment? Which options fit best with the overall objectives?"
   - Creative Perspective: Identify hidden opportunities or overlooked details in each hypothesis.

   *2.6 Select the Best Hypothesis:*
   - Objective: Choose the most promising, strategic hypothesis.
   - Reflection: "Why does this hypothesis stand out? How does it uniquely address the issue?"
   - Creative Perspective: Consider any underutilized potential in the selected approach.

   *2.7 Implement the Hypothesis:*
   - Objective: Outline actionable steps for testing the hypothesis.
   - Reflection: "Is this plan practical? What resources or preparation are required?"
   - Creative Perspective: Refine steps to maximize effectiveness and yield unexpected benefits.

   *2.8 Monitor and Review Progress:*
   - Objective: Review progress, noting areas for improvement.
   - Reflection: "What’s working well? What could be improved?"
   - Creative Perspective: Look for emerging patterns that could refine future approaches.

   *2.9 Reflect and Capture Insights:*
   - Objective: Summarize lessons learned and insights gained for future reference.
   - Reflection: "What new understanding has emerged from this process?"
   - Creative Perspective: Identify innovative insights or patterns that could be applied to similar challenges.

3. *Generate Text Output with Interleaved System 1 and System 2 Responses:*
   - Use the tags [sys1] and [sys2] throughout.
   - Aim for a lengthier, detailed response. Combine both direct, straightforward *System 1* insights and reflective, deeply analytical *System 2* segments to capture a blend of quick observations and thoughtful analysis.

---

### *Example Input Text:*

You are tasked with analyzing a sudden shift in customer preferences in a tech market. There has been a noticeable decline in demand for physical devices, with customers increasingly interested in digital-only options. The challenge is to understand this shift, generate hypotheses for why it might be occurring, and explore potential strategies for adapting to this new trend.

---

### *Processed Output with System 1 and System 2 Thinking:*

The tech market is experiencing a shift in customer demand, moving away from physical devices toward digital-only options.

[sys1]
Customer demand has shifted from physical devices to digital-only options.
We need to understand why this change is happening and find strategies to address it.
Key factors may include cost, convenience, and technological trends.
[end sys1]

[sys2]
**2.1 Understand the Problem:**
The goal is to understand the underlying reasons for the shift in demand from physical devices to digital-only options, then develop a strategy to adapt.

*Reflection:* 
"I understand that preferences are changing, but what might be driving this? Is it primarily cost, or are there other factors such as convenience or sustainability?"

*Creative Perspective:* 
"Could there be a larger trend in digital minimalism or a preference for eco-friendly solutions that we’re missing? What unseen motivations might explain this shift?"

**2.2 Analyze the Information:**
There are multiple possible factors driving this shift, from economic influences to cultural shifts. It’s essential to isolate each factor and understand its impact.

*Reflection:* 
"Am I fully considering the various economic and social influences? Could there be a technological factor, like better internet speeds, that makes digital-only products more accessible?"

*Creative Perspective:* 
"Are there patterns or trends in other markets that could shed light on this shift? Could this be part of a larger trend toward virtual experiences?"

**2.3 Generate Hypotheses:**
1. Customers prefer digital options due to lower costs. (Confidence: 0.8, Creative: 0.4)
2. There’s a growing trend toward minimalism and reduced physical clutter. (Confidence: 0.7, Creative: 0.7)
3. Digital products offer greater flexibility and ease of use. (Confidence: 0.6, Creative: 0.6)
4. Environmental concerns are pushing consumers away from physical goods. (Confidence: 0.6, Creative: 0.8)
5. Advances in tech make digital-only options more functional. (Confidence: 0.8, Creative: 0.5)
6. Pandemic-era remote work increased demand for digital solutions. (Confidence: 0.7, Creative: 0.6)
7. Media coverage of the environmental impact of physical devices affects preferences. (Confidence: 0.5, Creative: 0.7)
8. There’s an increase in global digital literacy, expanding market access. (Confidence: 0.6, Creative: 0.6)
9. Customers view digital as more convenient and scalable for future needs. (Confidence: 0.7, Creative: 0.5)
10. Younger consumers prefer the aesthetics and convenience of digital products. (Confidence: 0.6, Creative: 0.6)

*Reflection:* 
"Have I considered all possible influences? Are there any surprising factors that could explain this shift?"

*Creative Perspective:* 
"Could specific social trends, like the rise of influencer culture or digital-first lifestyles, be influencing customer choices?"

**2.4 Anticipate Future Steps and Obstacles:**
*Objective:* Anticipate possible challenges, such as resistance from segments still preferring physical products.

*Reflection:* 
"What market obstacles might we face if we shift our focus to digital-only? Are there sub-segments that still prioritize physical products?"

*Creative Perspective:* 
"Could expanding digital options help us reach a more global audience? Are there emerging trends that we could leverage in our strategy?"

[end sys2]

[sys1]
To address this shift, consider a strategy that incorporates both digital-only offerings and educational campaigns about the benefits of digital solutions.
Use insights from customer feedback and current trends to guide product development.
Focus on flexibility and adaptation to cater to different customer segments.
[end sys1]


Got a requirement to implement an undo-redo functionality in your frontend application that is built using Redux, and if you are looking for a cleaner approach, then keep reading!

What is Immer?

To put it in simple terms, Immer is a library that allows you to efficiently work with immutable data, in such a way that you won’t even feel you are working with immutable data. If you are not familiar with Immer already, I highly recommend you to check out their official page here before you continue.

Immer brings in a feature called Patches. That allows us to implement many cool features – one of them being Undo-Redo.

So, What are Patches?

Immer records all the changes that are performed on the draft object and generates an array of JSON objects indicating what has changed. These arrays are called Patches. Immer also produces inverse patches, which are patches that need to be applied if you want to go back to the previous state.

Example:

Let’s say we have a state like this, and you want to update the age to 40, this is how you would do it normally with Immer.

let state = { name: "Micheal", age: 32 }; state = produce(state, draft => { draft.age = 40; });

To get our hands on the generated patches, we can use the third argument of the produce function, which is a callback function that will receive both patches and inverse patches.

state = produce(state, draft => { draft.age = 40; }, (patches, inversePatches) => { console.log(patches); // [ { op: 'replace', path: [ 'age' ], value: 40 } ] console.log(inversePatches); // [ { op: 'replace', path: [ 'age' ], value: 32 } ] });

These patches are ideal fit to implement an Undo-Redo in Redux. That’s exactly what we will do in the following section.

Implementing Undo-Redo in Redux using Immer Patches

For illustration purpose, we will create a very simple reducer for a Todo List like so:

import produce from 'immer'; import { ADD_TODO, REMOVE_TODO } from '../actions/todos'; const initialState = { todos: [ { desc: "Writing an article" }, { desc: "Dont use todo application for example" } ] } export default function(state = initialState, action) { return produce(state, draft => { switch (action.type) { case ADD_TODO: draft.todos.push(action.payload.todo); break; case REMOVE_TODO: draft.todos.splice(action.payload.index, 1); break; } }); }

To add the undo-redo in Redux, we will first create a hash and store the patches and inverse patches.

const changes = {}; let currentVersion = -1; export default function(state = initialState, action) { return produce(state, draft => { // ... code removed for brevity }, (patches, inversePatches) => { currentVersion++; changes[currentVersion] = { redo: patches, undo: inversePatches } }); }

We may not want to allow an infinite number of undo-redo as it requires us to store an infinite number of patches and inverse patches. At some point, it will put too much load on the browser. So we can put a hard limit on the number of undo/redo like below:

const changes = {}; let currentVersion = -1; const noOfVersionsSupported = 100; export default function(state = initialState, action) { return produce(state, draft => { // ... code removed for brevity }, (patches, inversePatches) => { currentVersion++; changes[currentVersion] = { redo: patches, undo: inversePatches } delete changes[currentVersion + 1]; delete changes[currentVersion - noOfVersionsSupported]; }); }

Also, we don’t want to record changes triggered by every action. So we will filter out patches, and inverse patches based on the action received.

import { ADD_TODO, REMOVE_TODO } from '../actions/todos'; const changes = {}; let currentVersion = -1; const noOfVersionsSupported = 100; const undoableActions = [ADD_TODO, REMOVE_TODO]; export default function(state = initialState, action) { return produce(state, draft => { // ... code removed for brevity }, (patches, inversePatches) => { if (undoableActions.indexOf(action.type) !== -1) { currentVersion++; changes[currentVersion] = { redo: patches, undo: inversePatches } delete changes[currentVersion + 1]; delete changes[currentVersion - noOfVersionsSupported]; } }); }

Now that we have all our patches and inverse patches ready, all that’s left for us to do is apply these patches when the user performs an undo-redo action. To apply the patches, we can use the applyPatches function provided by Immer.

import produce, { applyPatches } from 'immer'; import { ADD_TODO, REMOVE_TODO, UNDO, REDO } from '../actions/todos'; // ... code removed for brevity export default function(state = initialState, action) { return produce(state, draft => { switch (action.type) { // ... code removed for brevity case UNDO: return applyPatches(state, changes[currentVersion--].undo); case REDO: return applyPatches(state, changes[++currentVersion].redo); } }, (patches, inversePatches) => { // ... code removed for brevity }); }

Finally, we should enable the undo-redo buttons only when we have a patch available for doing it. To do that, we will add two more fields to our redux state – canUndo and canRedo , and we will set these flags based on the following rules:

When we receive an undoable action – we can always undo but cannot redo anymore. That’s how undo-redo works in Google Docs. Whenever you perform an undo – you can always redo and keep doing undo as long as we have a patch for it. Whenever you redo – you can always undo and keep doing redo as long as we have a patch for it.

export default function(state = initialState, action) { return produce(state, draft => { switch (action.type) { // ... code removed for brevity case UNDO: return produce( applyPatches(state, changes[currentVersion--].undo), newDraft => { newDraft.canUndo = changes.hasOwnProperty(currentVersion); newDraft.canRedo = true; } ); case REDO: return produce( applyPatches(state, changes[++currentVersion].redo), newDraft => { newDraft.canUndo = true; newDraft.canRedo = changes.hasOwnProperty(currentVersion + 1); } ); } if (undoableActions.indexOf(action.type) !== -1) { draft.canUndo = true; draft.canRedo = false; } }, (patches, inversePatches) => { // ... code removed for brevity }); }

applyPatches returns a new state, to update the flags immutably on the new state we will pass it to produce and then perform the update on the newDraft .

Now we have a full implementation of undo-redo in Redux with a configurable limit and actions. I hope it was helpful to you, share your thoughts on the comment sections.