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]


Q:

State is unchanged from within a function returned by a hook

I'm playing around with React and Canvas. I wanna animate the movement of a square through requestAnimationFrame. So I made the main component to handle canvas element and update of square's position:
function App() {
    let canvas = useRef()
    let square = useSquare(WIDTH / 2, HEIGHT, 2)
    let update = () => {
        square.update()
        requestAnimationFrame(update)
    }
    useEffect(update, [])
    return <>
        <canvas ref={canvas} width={WIDTH} height={HEIGHT} />
        <Renderer.Provider value={() => ref.canvas.getContext("2d")}>
            <Square {...square} />
        </Renderer.Provider>
    </>
}

The Square is a component but it doesn't return JSX. It runs drawing oprations at useEffect:
function Square({ x, y }) {
    let getContext = useContext(Renderer)
    useEffect(() => {
        let ctx = getContext()
        ctx.fillStyle = "#000"
        ctx.fillRect(x, y, 10, 10)
    }, [x, y])
    return null;
}

And I wanna use a hook to encapsulate state and behavior of the square:
function useSquare(init_x, init_y) {
    let [x, set_x] = useState(init_x)
    let [y, set_y] = useState(init_y)
    let [vx, set_vx] = useState(10)
    let [vy, set_vy] = useState(-5)
    let update = () => {
        set_x(prev_x => prev_x + vx)
        set_y(prev_y => prev_y + vy)
        if (x <= 0 || x >= WIDTH) set_vx(prev_vx => -prev_vx)
        else if (y <= 0 || y >= HEIGHT) set_vy(prev_vy => -prev_vy)
    }
    return { update, x, y }
}

Seems reasonable to me. However, it doesn't work as expected. Square is moving, but it doesn't respond to collisions with the viewport borders.
If I put console.log(x, y) into either of update functions, I can see it fires with the expected rate, but the state isn't changing.
I don't understand why the component is able to render correctly if the state isn't changing. Frankly, I have no idea what I'm doing wrong. Perhaps, someone helps me to clarify. Thanks in advance.
PS: I made a codesanbox with the example https://codesandbox.io/s/xenodochial-jepsen-nfxv6

A:

The problem is that the update function returned from useSquare is a closure and the value of x and y inside it never change, thus the condition of x <= 0 || x >= WIDTH and y <= 0 || y >= HEIGHT are never true. Here is an example of closure:

let x = 1;

function update(y) {
  return function() {
    console.log(y); // always 1
  };
}
setInterval(update(x), 1000);
x = 2;

Closure related bugs are hard to be identified. While you can learn more about closures in various resources including MDN, you can use the exhaustive-deps linting rule in eslint-plugin-react-hooks package to make sure your dependencies array specified in hooks are specified correctly and prevent potential bugs. React docs (Such rule is enabled by default in CodeSandbox.)
But before that, let's simplify the task to find a better way to tackle the problem. Let's say there is a state x that will keep incrementing by 3 until it hits 20. Then it will keep decrementing by the same value until it hits 0.
In this case, we use +1/-1 to represent the direction of increment/decrement. Since this direction changes shouldn't trigger a re-render, we don't have to store it as a state variable. Instead, we store it as ref since we want to access its latest value when computing the new x. To detect if x hits the limits, we set up a useEffect hook. The full implementation would be:
import React, { useState, useRef, useEffect } from "react";
const MAX = 20;
const RATE = 3;

function App() {
  let [x, setX] = useState(0);
  const direction = useRef(1);
  useEffect(() => {
    const id = setInterval(() => {
      setX(val => val + direction.current * RATE);
    }, 500);
    return () => clearInterval(id);
  }, []);
  useEffect(() => {
    if (x >= MAX) direction.current = -1;
    if (x <= 0) direction.current = 1;
  }, [x]);
  return <div>{x}</div>;
}

Back to your case, there are few places that should be updated and the main part is inside useSquare. Like the above example, we no longer store vx and vy as state. Instead, initialize them with useRef. Two useEffect hooks are also set up to change their values according to x and y values.
// useSquare.js    
import { useState, useRef, useEffect, useCallback } from "react";
import { WIDHT, HEIGHT } from "./settings";

export function useSquare(init_x, init_y) {
  let [x, set_x] = useState(init_x);
  let [y, set_y] = useState(init_y);
  let vx = useRef(10);
  let vy = useRef(-5);

  let update = useCallback(() => {
    set_x(prev_x => prev_x + vx.current);
    set_y(prev_y => prev_y + vy.current);
  }, []);

  useEffect(() => {
    if (x >= WIDHT) vx.current = -10;
    if (x <= 0) vx.current = 10;
  }, [x]);

  useEffect(() => {
    if (y <= 0) vy.current = 5;
    if (y >= HEIGHT) vy.current = -5;
  }, [y]);

  useEffect(() => {
    let id;
    function cb() {
      update();
      id = requestAnimationFrame(cb);
    }
    cb();
    return () => cancelAnimationFrame(id);
  }, [update]);

  return { x, y };
}

And the app.js becomes:
function App() {
  let canvas = useRef();
  let square = useSquare(WIDHT / 2, HEIGHT / 2);
  return (
    <>
      <canvas ref={canvas} width={WIDHT} height={HEIGHT} />
      <Renderer.Provider value={() => canvas.current.getContext("2d")}>
        <Square {...square} />
      </Renderer.Provider>
    </>
  );
}

Notice I put wrap the update function with an useCallback hook so that it will not change with x and y values. I also put the animation function inside useSquare hook. If you move it back to App.js, make sure you set the dependencies array right.
Here is the updated sandbox: