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 function that captures and retains access to variables from its enclosing scope, even after that scope has finished executing.

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.

A step-by-step procedure for solving a problem or performing a computation, defined as a finite sequence of instructions.

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An automatic memory management process that identifies and reclaims memory no longer in use by a program.

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