10. What is a first order function?

In JavaScript, a first-order function is simply a regular function that does not take another function as an argument or return a function. It operates on basic values and does not involve higher-order function capabilities.

Example of a first-order function:

javascript
CopyEdit
function add(a, b) {
  return a + b;
}

console.log(add(3, 5)); // Output: 8

Contrast with higher-order functions:

A higher-order function either:

• Takes a function as an argument
• Returns a function

Example of a higher-order function:

javascript
CopyEdit
function operate(operation, a, b) {
  return operation(a, b);
}

function multiply(x, y) {
  return x * y;
}

console.log(operate(multiply, 3, 5)); // Output: 15

Summary:

• First-order function: Works only with basic values.
• Higher-order function: Accepts or returns other functions.

Let me know if you need more clarification!