Array vs Collection

Question posted in Computer Software on 05 2011

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What are the differences between an array and a collection?
when will you use it ?

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11 Answers

LanceR

An array is a data structure that contains several variables of the same type.
An array has the following properties:

Single-Dimensional, Multidimensional or Jagged.

A jagged array is an array of arrays, and therefore its elements are reference types and are initialized to null.

Arrays are zero indexed: an array with n elements is indexed from 0 to n-1.

Array types are reference types derived from the abstract base type Array. Since this type implements IEnumerable and IEnumerable, you can use foreach iteration on all arrays in C#.

From: http://msdn.microsoft.com/en-us/library/9b9dty7d.aspx

A collection is simply an object that groups multiple elements into a single unit. Collections are used to store, retrieve, manipulate, and communicate aggregate data.

Versions of collections include list, binary-trees, hashtables.

The difference is that arrays are list of variables of the same type. Collections can contain objects or data of any type.

ref: http://en.wikipedia.org/wiki/Collection_(computing)

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Collections are dynamic in that they grow or shrink as you add and remove items from them.
Arrays tend to fixed in size, i.e. they can only contain a certain number of values. When you want to resize them then you need to recreate them which is normally done with the Redim statement but some languages don't allow arrays to be resized. Arrays are static in that they don't grow or shrink as you add/remove items from them.

Both allow sorting and you can get the number of elements in each very easily.Arrays use less memory and tend to perform faster(not always) Colelctions are great to work with, so easy.

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