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 reusable solution template for commonly occurring problems in software design.

The smallest unit of execution within a process, allowing concurrent operations to run within a single program.

Code that is easy to read, understand, and maintain — following consistent conventions, meaningful naming, and single-responsibility functions.

Regex (Regular Expression)

A sequence of characters that defines a search pattern, used for string matching, validation, and text manipulation.

Observer Pattern

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

Singleton Pattern

A design pattern that restricts a class to a single instance and provides a global point of access to that instance.

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