Explain the below javascript 

const steps = Array.from(document.querySelectorAll("form .step"));  
 const nextBtn = document.querySelectorAll("form .next-btn");  
 const prevBtn = document.querySelectorAll("form .previous-btn");  
 const form = document.querySelector("form");  
 nextBtn.forEach((button) => {  
  button.addEventListener("click", () => {  
   changeStep("next");  
  });  
 });  
 prevBtn.forEach((button) => {  
  button.addEventListener("click", () => {  
   changeStep("prev");  
  });  
 });  
 form.addEventListener("submit", (e) => {  
  e.preventDefault();  
  const inputs = [];  
  form.querySelectorAll("input").forEach((input) => {  
   const { name, value } = input;  
   inputs.push({ name, value });  
  });  
  console.log(inputs);  
  form.reset();  
 });  
 function changeStep(btn) {  
  let index = 0;  
  const active = document.querySelector(".active");  
  index = steps.indexOf(active);  
  steps[index].classList.remove("active");  
  if (btn === "next") {  
   index++;  
  } else if (btn === "prev") {  
   index--;  
  }  
  steps[index].classList.add("active");  
 }  

user
Sure, I'd be happy to explain this JavaScript code.

Firstly, let's break down the code line by line:

1. `const steps = Array.from(document.querySelectorAll("form .step"));`
   - This line selects all the elements with the class "step" that are nested inside a form. The `Array.from()` method converts the NodeList returned by `querySelectorAll()` to an Array.

2. `const nextBtn = document.querySelectorAll("form .next-btn");`
   - This line selects all the elements with the class "next-btn" that are nested inside a form.

3. `const prevBtn = document.querySelectorAll("form .previous-btn");`
   - This line selects all the elements with the class "previous-btn" that are nested inside a form.

4. `const form = document.querySelector("form");`
   - This line selects the first form element on the page.

5. `nextBtn.forEach((button) => {...});`
   - This line iterates over each element in the `nextBtn` collection and executes the code inside the parentheses for each element.

6. `prevBtn.forEach((button) => {...});`
   - Similar to the above line.

7. `form.addEventListener("submit", (e) => {...});`
   - This line listens for the "submit" event on the form element. The `(e)` parameter is an event object, which allows us to access details about the event.

8. `function changeStep(btn) {...}`
   - This line defines a function called "changeStep". It takes a single argument, "btn", which is a string indicating whether to go "next" or "prev".

Here's what each part of the code does:

1. `Array.from(document.querySelectorAll("form .step"));`
   - This line creates an array of all the elements with the class "step" inside the form.

2. `document.querySelectorAll("form .next-btn");`
   - This line selects all the elements with the class "next-btn" inside the form.

3. `document.querySelectorAll("form .previous-btn");`
   - Same as above, but for the class "previous-btn".

4. `document.querySelector("form");`
   - This line selects the first form element on the page.

5. `form.querySelectorAll("input").forEach((input) => {...});`
   - This line selects all the input elements inside the form and iterates over them.

6. `nextBtn.forEach((button) => {...});`
   - This line listens for a click event on each button with the class "next-btn" and executes the code inside the `foreach` function.

7. `prevBtn.forEach((button) => {...});`
   - Same as above, but for each button with the class "previous-btn".

8. `form.addEventListener("submit", (e) => {...});`
   - This line listens for the "submit" event on the form. When the event fires, the code inside the callback function will execute.

9. `function changeStep(btn) {...}`
   - This line defines a function called "changeStep". It takes a single argument, "btn", which is a string indicating whether to go "next" or "prev".

Then, inside the `changeStep` function, we have the lines:

```
let index = 0;
const active = document.querySelector(".active");
index = steps.indexOf(active);
steps[index].classList.remove("active");
if (btn === "next") {
  index++;
} else if (btn === "prev") {
  index--;
}
steps[index].classList.add("active");
```

These lines find the currently active step, adjust the step based on the "next" or "prev" button click, and then adds the "active" class to the newly active step. This is a common pattern for multi-step forms.
assistant
Explain the below javascript 

const steps = Array.from(document.querySelectorAll("form .step"));  
 const nextBtn = document.querySelectorAll("form .next-btn");  
 const prevBtn = document.querySelectorAll("form .previous-btn");  
 const form = document.querySelector("form");  
 nextBtn.forEach((button) => {  
  button.addEventListener("click", () => {  
   changeStep("next");  
  });  
 });  
 prevBtn.forEach((button) => {  
  button.addEventListener("click", () => {  
   changeStep("prev");  
  });  
 });  
 form.addEventListener("submit", (e) => {  
  e.preventDefault();  
  const inputs = [];  
  form.querySelectorAll("input").forEach((input) => {  
   const { name, value } = input;  
   inputs.push({ name, value });  
  });  
  console.log(inputs);  
  form.reset();  
 });  
 function changeStep(btn) {  
  let index = 0;  
  const active = document.querySelector(".active");  
  index = steps.indexOf(active);  
  steps[index].classList.remove("active");  
  if (btn === "next") {  
   index++;  
  } else if (btn === "prev") {  
   index--;  
  }  
  steps[index].classList.add("active");  
 }  

user
This JavaScript code is for a form with multiple steps, where each step is a separate section of the form. The user can navigate through these steps using "next" and "previous" buttons. Here's a breakdown of what each part of the code does:

1. `const steps = Array.from(document.querySelectorAll("form .step"));` - This line selects all elements with the class "step" that are inside a form and stores them in an array called "steps". The "Array.from" method is used to convert the NodeList returned by "querySelectorAll" into a regular array.

2. `const nextBtn = document.querySelectorAll("form .next-btn");` and `const prevBtn = document.querySelectorAll("form .previous-btn");` - These lines select all elements with the classes "next-btn" and "previous-btn" that are inside a form. These are the buttons that the user will click to navigate through the steps of the form.

3. `nextBtn.forEach((button) => {...});` and `prevBtn.forEach((button) => {...});` - These blocks of code add a "click" event listener to each "next" and "previous" button. When a button is clicked, the "changeStep" function is called with either "next" or "prev" as an argument.

4. `form.addEventListener("submit", (e) => {...});` - This block of code adds a "submit" event listener to the form. When the form is submitted, it prevents the default form submission behavior, collects all input values from the form, logs them to the console, and then resets the form.

5. `function changeStep(btn) {...}` - This function is called when the user clicks a "next" or "previous" button. It changes the currently active step of the form based on the button that was clicked. It first finds the index of the currently active step, removes the "active" class from that step, and then adds the "active" class to the new step (either the next or previous one). If the "next" button was clicked, it increments the index; if the "previous" button was clicked, it decrements the index.
assistant