Coding & Skills
204 articles in this topic
React Virtual DOM and Reconciliation: How Diffing Works and Why the key Prop Matters
Follow React from two element trees to the real DOM, then compare index keys with stable data keys in a reordered list of stateful input nodes.
JavaScript Promises and async/await Explained: Error Handling, Execution Order, and Output Questions
Build a precise call-stack and queue model, use it to predict six output lines, and see why one missing await can move a rejection beyond try/catch.
Python Tuples Tutorial: Packing, Unpacking, Methods and Examples
Learn how Python tuples work through runnable examples, a fixed-record route program, precise error fixes and four predict-before-running exercises.
AVL Trees for GATE: Rotations, Height Bounds and Minimum-Node Numericals Solved
Choose LL, RR, LR or RL from the insertion path, then solve AVL height questions with the minimum-node recurrence and a consistent height convention.
Functions in C: 12 Solved MCQs on Declarations, Definitions and Function Types
Separate a C function's prototype, body and call, then practise the details through 12 explained questions covering parameters, return values and linking.
Templates in C++: Function and Class Templates with Runnable Examples
Learn how C++ templates turn one type-safe blueprint into reusable functions and classes. Trace deduction, fix compiler errors, and test each idea with runnable examples.
AI Agent Architecture and Program Types MCQs: 11 Solved Questions
Eleven solved AI agent MCQs with the trap in each one named: current-percept rules, sensor versus actuator, goal versus utility scoring, and what counts as learning.
Strings in C Tutorial: Declaration, Input, Functions and Worked Examples
Learn how C strings use character arrays and the null terminator, then practise safe input, traversal, reversal, library calls and capacity checks.
React Forms: Controlled vs Uncontrolled Components, Validation and the Interview Questions
Follow the value through a state-driven form and a ref-driven form, then choose the right model for live validation, simple inputs and file uploads.
Interface vs Abstract Class in Java: Differences, Default Methods and Exam Questions
Replace the old textbook rule with a current comparison, then solve the two-default-method conflict that appears in Java output and compilation questions.
Python Lists Tutorial: Create, Update, Slice and Use Lists with Examples
Learn Python lists through one clear path, from creation and indexing to mutation, comprehensions, copying, and exam-style output questions.
Stack and Queue Implementation in Java: Arrays, Linked Lists, and the Interview Problems That Use Them
Implement stacks and circular queues in Java, trace every pointer through wrap-around, and choose the right standard collection for real code.