Coding & Skills
365 articles in this topic
Mongoose Validation: Enforce Schema Invariants and Avoid Update Traps
Trace one Plan model through saves, query updates and database errors. The worked cases show exactly where Mongoose rules hold and where an update can bypass them.
Updated 23 Sep 20265 min readWeb Development
Optional in Java: Null-Safe Patterns with Runnable Examples
Learn Java Optional from creation to stream pipelines through one user lookup. Trace present and empty paths, compare fallbacks, and repair common mistakes.
Updated 23 Sep 20265 min readJava
Python Operators and Expressions: Precedence, Types and Worked Output Traces
Trace Python expressions without guessing. This guide connects operator families, precedence, types, short-circuiting and exact output through worked examples.
Updated 23 Sep 20266 min readPython
Data Structure for GATE: Syllabus Map, Past-Paper Weightage and Preparation Order
Map the official GATE Data Structure scope, read the two 2026 CS sessions without turning them into a forecast, and follow a verified 48-hour study order.
Updated 23 Sep 20264 min read91 viewsDSA & Algorithms
C# vs C++: Managed .NET, Native Control, and the Trade-offs That Matter
Compare one component in C# and C++, then use its lifetime, generic, build, and interop behaviour to choose the right model for your software.
Updated 23 Sep 20266 min readProgramming Languages Survey
C++ std::string_view: Fast Read-Only Text APIs Without Accidental Copies
Learn when a read-only text API should take std::string_view, then trace one request parser and spot the lifetime errors that make views dangle.
Updated 22 Sep 20266 min readC++
Local Search in Artificial Intelligence: Hill Climbing, Traps and a Worked Example
Local search keeps little memory, yet it can settle for a poor state. Learn the five-part model, trace hill climbing, diagnose its traps and compare standard escape methods.
Updated 22 Sep 20265 min readML & Data Science
JavaScript map, filter and reduce Together: Build an Order Pipeline Step by Step
Follow one complete order example from raw API data to per-customer totals. See the array after map and filter, then trace every reduce accumulator.
Updated 22 Sep 20266 min readWeb Development
Executor Framework in Java: Thread Pools, Futures and Runnable Examples
Separate tasks from threads, trace a two-worker pool, and learn how futures, shutdown, cancellation and bounded queues behave in Java.
Updated 22 Sep 20266 min readJava
CSV Files Explained: Parsing Rules, Worked Records and Exam Traps
Learn why commas and newlines are not always boundaries, trace a quote-aware parser, validate text fields with a schema, and calculate processing costs.
Updated 22 Sep 20265 min readPython
Shortest Path Algorithms: Dijkstra, Bellman-Ford and Floyd-Warshall with Worked Examples for GATE CS
Learn the relaxation idea behind shortest paths, trace three core algorithms by hand, and choose the right method from edge weights and source count.
Updated 21 Sep 20265 min readDSA & Algorithms
C# Tutorial for Beginners: Types, Classes, LINQ and a First Console App
Build a complete C# console app around five candidate records. Learn how types, nullable references, classes, generic lists and LINQ work together, with every output and average checked by hand.
Updated 21 Sep 20266 min readProgramming Languages Survey