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Encyclopedia > Judy array

In computer science and software engineering, a Judy array is a complex but very fast associative array data structure for storing and looking up values using integer or string keys. Unlike arrays, Judy arrays may be sparse; that is, they may have large ranges of unassigned indices. Wikibooks Wikiversity has more about this subject: School of Computer Science Open Directory Project: Computer Science Downloadable Science and Computer Science books Collection of Computer Science Bibliographies Belief that title science in computer science is inappropriate Categories: | ... Software engineering (SE) is the profession that creates and maintains software applications by applying technologies and practices from computer science, project management, engineering, application domains and other fields. ... In computing, an associative array, also known as a map, lookup table, or dictionary, is an abstract data type very closely related to the mathematical concept of a function with a finite domain. ... A binary tree, a simple type of branching linked data structure. ... In computer programming, an array, also known as a vector or list, is one of the simplest data structures. ...


Judy arrays are designed to keep the number of processor cache-line fills as low as possible, and the algorithm is internally complex in an attempt to satisfy this goal as often as possible. Due to these cache optimizations, Judy arrays are fast, sometimes even faster than a hash table. This article or section should be merged with CPU cache. ... In computer science, a hash table is a data structure that speeds up searching for information by a particular aspect of that information, called a key. ...


Roughly speaking, the data structure's designer describes it as similar to a highly-optimised 256-ary trie data structure. A trie for keys to, tea, ten, in, inn. In computer science, a trie is an ordered tree data structure that is used to store an associative array where the keys are strings. ...

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  Results from FactBites:
 
Array - Wikipedia, the free encyclopedia (1460 words)
Arrays permit efficient (constant time, O(1)) random access but not efficient insertion and deletion of elements (which are O(n), where n is the size of the array).
Dynamic arrays or growable arrays are arrays which automatically perform this resizing as late as possible, when the programmer attempts to add an element to the end of the array and there is no more space.
The zero-based array was made popular by the C programming language, in which the abstraction of array is very weak, and an index n of an array is simply the address of the first element offset by n units.
array - definition of array in Encyclopedia (1329 words)
Arrays hold a fixed number of equally-sized data elements, generally of the same data type.
A drawback of the simplicity of arrays is the possibility of referencing a non-existent element by using an index outside the range of valid indices.
Arrays of arrays, on the other hand, allow the creation of ragged arrays, in which the valid range of one index depends on the value of another, or in this case, simply that different rows can be different sizes.
  More results at FactBites »


 

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