How to pass parameters to a Promise function with JavaScript?

To pass parameters to a Promise function in JavaScript, you can define the function to take parameters as arguments, and use those arguments in the Promise body.

Here’s an example of a Promise function that takes two parameters x and y:

function add(x, y) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (typeof x !== 'number' || typeof y !== 'number') {
        return reject(new Error('Both arguments should be numbers'));
      }
      resolve(x + y);
    }, 1000);
  });
}

add(2, 3)
  .then(sum => {
    console.log(sum); // 5
  })
  .catch(error => {
    console.error(error);
  });

In this example, the add function takes two parameters x and y. It returns a Promise that resolves with the sum of x and y after a one-second delay, or rejects with an error if either x or y is not a number. To use the add function, we call it with two arguments, and use the then method to handle the resolved value, or the catch method to handle the rejected error.