Programming Concepts Beginner

What is Data Structure?

A way of organizing and storing data in a computer so it can be accessed and modified efficiently.

Data structures define how data is stored and accessed. Arrays provide indexed access. Linked lists allow efficient insertions. Hash tables enable O(1) lookups. Trees organize hierarchical data. Graphs model complex relationships.

Choosing the right data structure dramatically affects performance. Stacks (LIFO) and queues (FIFO) manage ordered operations. Heaps efficiently find min/max values. Tries optimize string searching.

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A mathematical notation that describes the worst-case performance of an algorithm as input size grows.

Version Control

A system that records changes to files over time, allowing you to recall specific versions, collaborate, and track history.

A bug that occurs when the behavior of software depends on the timing or order of uncontrolled events like thread scheduling.

Two memory regions: the stack stores function call data with automatic cleanup, while the heap stores dynamically allocated objects.

Observer Pattern

A design pattern where an object (subject) maintains a list of dependents (observers) that are notified automatically of state changes.

Restructuring existing code without changing its external behavior to improve readability, maintainability, and performance.

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