DataTerminology.comNEW
An ordered collection of elements of the same type.
DESCRIPTION
An array stores elements in contiguous memory, enabling constant-time indexed access and efficient iteration. It underlies vectors, matrices, and tensors in numerical computing. While fixed-size in many languages, dynamic arrays grow by resizing. Arrays trade costly insertions/deletions in the middle for fast random access. They are fundamental in algorithms, data structures, and system-level programming.
ALTERNATIVE DEFINITIONS
Wikipedia
In computer science, an array is a data structure consisting of a collection of elements (values or variables), each identified by at least one array index or key.
Highlights indexing and contiguity central to array semantics.
Oracle Java Tutorials
An array is a container object that holds a fixed number of values of a single type.
Emphasizes fixed-size and single-type constraints in Java.
RELATED TERMS
Vector Matrix Dynamic Array Hash Table Indexing Memory Layout Contiguous Storage Big O Notation Pointer
COMPETING TERMS
RELATIONS
- Narrower: NumPy Array
KNOWLEDGE AREAS
Programming Languages Software Engineering Data Engineering
TARGET AUDIENCE
Software Developer Data Engineer AI Engineer
EXTERNAL SOURCES
- Wikipedia - Array data structure
- Oracle - Official Java arrays tutorial
- cppreference - C++ dynamic array (vector) reference
- NumPy - NumPy array creation basics
TOP QUESTIONS
Why are arrays fundamental in computing?
They offer O(1) random access, predictable memory layout, and efficient traversal, forming the basis for many higher-level structures.
Category: Relevancy
What is the difference between arrays and linked lists?
Arrays allow constant-time indexed access but costly middle insertions; linked lists enable cheap insertions but O(n) indexed access.
Category: Alternatives
When should I use a dynamic array?
Use dynamic arrays when the size is not known upfront, accepting occasional resize costs for amortized efficient appends.
Category: Requirements
What is cache locality in arrays?
Contiguous memory layout improves cache performance during sequential access, speeding up iteration and vectorized operations.
Category: Example
How expensive is inserting into the middle of an array?
Typically O(n) due to shifting elements to maintain contiguity.
Category: Example
Do arrays enforce single-type elements?
Many languages enforce homogeneous arrays for efficiency, though some support heterogeneous lists at a performance cost.
Category: Misunderstanding
What is the memory overhead of dynamic arrays?
They may allocate extra capacity and occasionally reallocate, trading memory for amortized O(1) append.
Category: Risk
How do arrays relate to matrices and tensors?
Matrices and tensors are multi-dimensional arrays enabling linear algebra and scientific computing.
Category: Example
What pitfalls occur with array indexing?
Off-by-one errors and out-of-bounds access lead to bugs, exceptions, or memory corruption.
Category: Mistakes