Passing Values to Functions with Arguments in JavaScript

In JavaScript, functions can accept input in the form of arguments. These arguments can be passed to the function when it is called, and can be used within the function to perform calculations or operations.

For example, consider the following function that calculates the area of a rectangle:

function calculateArea(length, width) {
  return length * width;
}

In this example, the function calculateArea accepts two arguments, length and width, which are used to calculate the area of a rectangle. To call this function and pass values for the length and width arguments, we would use the following syntax:

let area = calculateArea(5, 10);

In this example, the function is being passed the values 5 and 10 for the length and width arguments respectively, and the result of the function (the area of the rectangle) is being stored in the variable area.

JavaScript also support default values for arguments, in case a value is not passed to the function when it is called, the default value is used.

function calculateArea(length = 1, width = 1) {
  return length * width;
}

In this example, if no values are passed to the function when it is called, the length and width will be set to 1 by default.

Also, JavaScript have a feature called rest parameter, which allow a function to accept any number of arguments.

function sum(...numbers) {
  let total = 0;
  for (let number of numbers) {
    total += number;
  }
  return total;
}

In this example, the function sum uses the rest parameter ...numbers to accept any number of arguments, and adds them together to return the total.

let result = sum(1, 2, 3, 4, 5); // 15

Passing values to functions with arguments in JavaScript is a powerful feature that allows you to create reusable code and perform calculations based on input provided by the user or other parts of your program.