JavaScript Identity Function Challenge

The identity function is a fundamental concept in programming, playing a crucial role in functional programming paradigms. It's a function that returns the same value that was passed into it. Mastering the identity function is a stepping stone to understanding more complex functional programming patterns and immutability in JavaScript.

Problem Description

Your task is to create an identity function in JavaScript. This function should accept a single argument of any data type and return that exact same argument without any modification.

Requirements:

• The function must be named identity.
• It must accept exactly one argument.
• It must return the value of the argument it received.
• The function should work correctly for all JavaScript data types (primitives like strings, numbers, booleans, null, undefined, and objects like arrays, plain objects, functions, etc.).

Expected Behavior:

If you call identity(5), it should return 5. If you call identity("hello"), it should return "hello". If you call identity({ a: 1 }), it should return the object { a: 1 }. If you call identity(null), it should return null.

Examples

Example 1:

Input: 10
Output: 10
Explanation: The identity function receives the number 10 and returns it unchanged.

Example 2:

Input: "JavaScript is fun!"
Output: "JavaScript is fun!"
Explanation: The identity function receives the string "JavaScript is fun!" and returns it unchanged.

Example 3:

Input: { name: "Alice", age: 30 }
Output: { name: "Alice", age: 30 }
Explanation: The identity function receives an object and returns the exact same object reference.

Example 4:

Input: undefined
Output: undefined
Explanation: The identity function correctly handles the `undefined` primitive.

Constraints

• The function signature should be function identity(value) { ... } or an arrow function equivalent const identity = (value) => { ... };.
• No external libraries are allowed.
• The function should not perform any operations that mutate or alter the input value.

Notes

Think about how you can simply return the input. This problem is designed to be straightforward, emphasizing clarity and correctness over complex logic. Consider the different types of values JavaScript can hold and ensure your function handles them all as expected.