A first-order function is a function that does not take other functions as arguments or return functions as its result. It operates directly on values and performs computations or operations on them.

Characteristics of First-Order Functions

• No Function as Input:
• A first-order function only accepts standard data types (e.g., numbers, strings, arrays) as arguments, not other functions.
• No Function as Output:
• It does not return another function as its result.
• Direct Operation:
• It directly performs its intended task without involving higher-order operations like taking or returning other functions.

Example of First-Order Functions

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

console.log(add(2, 3)); // Output: 5

add is a first-order function because it takes two numbers as input and returns a number as output.