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How To Pass Parameter To A Promise Function

Parameter passing is a fundamental concept in programming, especially when it comes to working with Promise functions. Promises are a crucial part of asynchronous JavaScript, allowing you to manage and handle asynchronous operations effectively. In this article, we will explore how to pass parameters to a Promise function to enhance its flexibility and usability.

When working with Promise functions, you might encounter scenarios where you need to pass specific data or values to the function to achieve the desired outcome. Fortunately, JavaScript provides a straightforward way to achieve this by passing parameters when creating and calling Promise functions.

To pass a parameter to a Promise function, you can simply include the parameter in the function call when creating the Promise. Let's look at an example to illustrate this concept:

Javascript

function fetchData(data) {
    return new Promise((resolve, reject) => {
        // Perform asynchronous operation with the passed data
        if (data) {
            resolve(`Data received: ${data}`);
        } else {
            reject('Error: No data provided');
        }
    });
}

// Calling the Promise function with a parameter
fetchData('Hello, World!')
    .then((result) => console.log(result))
    .catch((error) => console.error(error));

In this example, the `fetchData` function takes a `data` parameter and returns a Promise. When calling the `fetchData` function, we pass the parameter `'Hello, World!'`. The Promise function then resolves with the message `'Data received: Hello, World!'` and logs it to the console.

It is essential to handle both the success and error scenarios when working with Promise functions. By using the `then` and `catch` methods, you can handle the resolved value or any potential errors that may occur during the Promise execution.

Additionally, you can pass multiple parameters to a Promise function by simply including them in the function call. This allows you to provide the necessary data or context required for the asynchronous operation within the Promise.

Javascript

function multiplyNumbers(num1, num2) {
    return new Promise((resolve, reject) => {
        // Perform multiplication operation with the provided numbers
        if (num1 && num2) {
            const result = num1 * num2;
            resolve(`Result: ${result}`);
        } else {
            reject('Error: Invalid numbers provided');
        }
    });
}

// Calling the Promise function with multiple parameters
multiplyNumbers(5, 10)
    .then((result) => console.log(result))
    .catch((error) => console.error(error));

In this example, the `multiplyNumbers` function takes two parameters, `num1` and `num2`, and returns a Promise that resolves with the multiplication result. By passing `5` and `10` as parameters when calling the function, the Promise function calculates the result (`50`) and logs it to the console.

By understanding how to pass parameters to a Promise function in JavaScript, you can enhance the versatility and functionality of your asynchronous code. Remember to handle both success and error scenarios effectively to ensure robust and reliable Promise-based operations in your applications.

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