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Recursion is a programming technique where a function calls itself to solve a problem by breaking it down into smaller, more manageable sub-problems...
The base case is the condition that stops the recursion. Without a base case, the function would call itself infinitely, leading to a stack overflow...
Each recursive call adds a new frame to the call stack. When the base case is reached, the stack begins to unwind, returning values back up the chain...
Consider the factorial function: factorial(n) = n × factorial(n-1), with factorial(0) = 1 as the base case. This means factorial(5) = 5 × 4 × 3 × 2 × 1...
Time complexity of recursive solutions varies. Fibonacci without memoization is O(2^n), while with dynamic programming it becomes O(n)...
Tail recursion is an optimization where the recursive call is the last operation in the function, allowing the compiler to reuse the current stack frame...
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Official Documentation — REST API Guide
Understanding RESTful API Architecture
REST (Representational State Transfer) is an architectural style for designing networked applications. It relies on a stateless, client-server communication protocol — almost always HTTP. RESTful applications use HTTP requests to perform CRUD operations.
GET /api/users — Retrieves a list of users
POST /api/users — Creates a new user
PUT /api/users/:id — Updates user by ID
DELETE /api/users/:id — Deletes user by ID
The server processes the request and returns a response with a status code. Common status codes include 200 (OK), 201 (Created), 400 (Bad Request), 404 (Not Found), and 500 (Internal Server Error). The response body typically contains JSON data...
Authentication is typically handled through Bearer tokens in the Authorization header. The client must include the token with every request to access protected endpoints...
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