useEffect Practicle
Tags: webdev, javascript, beginners, programming
Published: 2024-02-07 05:06:00

Certainly! I've added more detailed comments to help explain each section of the `useEffect` function:

```jsx
useEffect(() => {
  // Check if both selectedDateTo and selectedDateFrom are not empty
  if (selectedDateTo !== "" && selectedDateFrom !== "") {
    // Check if selectedDateTo is less than selectedDateFrom
    if (selectedDateTo < selectedDateFrom) {
      // Display a warning toast if the condition is true
      toast.warning("To Date should be equal to or greater than From Date", {
        position: toast.POSITION.TOP_RIGHT,
      });
      // Return early to prevent further execution
      return;
    }
  }

  // Check if All Status is selected and no date range is specified
  if (
    activeBusinessStatus === "All Status" &&
    !selectedDateFrom &&
    !selectedDateTo
  ) {
    // If true, set the business list data to the original tempData
    setBusinesslistData(tempData);
  } else {
    // Initialize filteredData with the original tempData
    let filteredData = tempData;

    // Check if a specific business status is selected
    if (activeBusinessStatus !== "" && activeBusinessStatus !== "All Status") {
      // Filter the data based on the selected status
      filteredData = filteredData.filter(
        (el) => el?.status === activeBusinessStatus
      );
    }

    // Check if a date range is specified
    if (selectedDateFrom && selectedDateTo) {
      // Output filteredData to the console for debugging
      console.log(filteredData, "filteredData fetch admin");

      // Filter the data based on the specified date range
      filteredData = filteredData.filter((el) => {
        const date = new Date(el.created_at);
        return date >= selectedDateFrom && date <= selectedDateTo;
      });
    }

    // Set the filtered data to the component state
    setBusinesslistData(filteredData);
  }
}, [activeBusinessStatus, selectedDateFrom, selectedDateTo]);
```

These comments provide a detailed explanation of each block and condition within the `useEffect` function.

Certainly! Let's break down the key concepts in simpler terms:

1. **`useEffect`**:
   - In simple terms, `useEffect` is a hook in React that allows you to perform side effects in your functional components.
   - Side effects are operations or tasks that happen after the component renders, like data fetching, updating the DOM, or interacting with external services.

2. **`filter`**:
   - The `filter` method is a way to sift through a collection of items (like an array) and pick out only the items that meet a certain condition.
   - In your code, `filter` is used to select specific items from the `tempData` array based on conditions related to business status and date.

3. **`Date`**:
   - The `Date` object in JavaScript is used to work with dates and times.
   - In your code, the `Date` object is used to convert the `created_at` property of each business item into a date object. This allows you to compare these dates and filter items based on a date range.

4. **`[activeBusinessStatus, selectedDateFrom, selectedDateTo]`**:
   - This is the dependency array for the `useEffect`. It tells React to re-run the `useEffect` whenever any of these values (`activeBusinessStatus`, `selectedDateFrom`, `selectedDateTo`) change.
   - In your code, it ensures that the filtering logic is applied whenever there's a change in the business status or the selected date range. It helps keep your component in sync with the latest data.

In simpler terms, the `useEffect` with `filter` and `Date` is like a smart assistant that keeps an eye on changes in business status and selected dates. Whenever there's a change, it sifts through the business data and updates what you see on the screen accordingly. The dependency array is like a notification system that says, "Hey, pay attention to these specific things, and when they change, do your job!"