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# Topic: Associative array

###### In the News (Mon 18 Feb 19)

 Associative array - Wikinfo In computing, an associative array, also known as a map or table, is an abstract data type very closely related to the mathematical concept of a function. Conceptually, an associative array is composed of a collection of keys and a collection of values, and each key is associated with one value. Associative arrays can be implemented in any programming language, and one or more implementations of them is typically found either built into the language or the standard library distributed with it (C is a noticeable exception, as neither the language nor the standard library directly provide one. www.wikinfo.org /wiki.php?title=Associative_array   (2968 words)

 Associative array - Wikipedia, the free encyclopedia An associative array (also map, hash, dictionary, finite map, lookup table, and in query-processing an index or index file) is an abstract data type composed of a collection of keys and a collection of values, where each key is associated with one value. Associative arrays are very closely related to the mathematical concept of a function with a finite domain. Associative arrays can be implemented in any programming language, and one or more implementations of them is typically found either built into the language or the standard library distributed with it (C is a notable exception, as neither the language nor the standard library directly provide one). en.wikipedia.org /wiki/Associative_array   (3167 words)

 Array - Wikipedia, the free encyclopedia Arrays also are among the most compact data structures; storing 100 integers in an array takes only 100 times the space required to store an integer, plus perhaps a few bytes of overhead for the pointer to the array (4 on a 32-bit system). 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. en.wikipedia.org /wiki/Array   (1938 words)

 Associative array In computing, an associative array, also known as a map or table, is an abstract data type very closely related to the mathematical concept of a function. Conceptually, an associative array is composed of a collection of keys and a collection of values, and each key is associated with one value. Associative arrays can be implemented in any programming language, and one or more implementations of them is typically found either built into the language or the standard library distributed with it (C is a noticeable exception, as neither the language nor the standard library directly provide one. www.teachersparadise.com /ency/en/wikipedia/a/as/associative_array.html   (981 words)

 Array Functions Arrays are also a big part of the Perl language and Perl has a lot of functions to help you work with them. Some of the actions arrays perform include deleting elements, checking for the existence of an element, reversing all of the the elements in an array, and sorting the elements. array, the environment of the current process is changed, not that of the parent. www.cs.cf.ac.uk /Dave/PERL/node57.html   (900 words)

 Perl Arrays The elements of an associative array have no order, they are just a collection of (key,value) pairs that can be treated as a group. Although there are associative array operators in perl, typically you deal with individual elements and not an entire assoc. These associative arrays can be as large as you want (as large as the memory in your computer). www.cs.rpi.edu /~hollingd/eiw/notes/PerlArrays/PerlArrays.html   (2189 words)

 The PHP Associative Array - PHP In the previous tutorial, you learned that an array is a variable that stores several values or elements of data organized by index keys. The keys in an associative array are "named" keys which means that the keys are usually character strings. You use the key to reference an element in an associative array. www.bellaonline.com /articles/art31316.asp   (239 words)

 Associative Arrays   (Site not responding. Last check: ) Associative arrays are a very useful and commonly used feature of Perl. Associative arrays basically store tables of information where the lookup is the right hand key (usually a string) to an associated scalar value. When you declare an associative array the key and associated values are listed in consecutive pairs. www.cs.cf.ac.uk /Dave/PERL/node30.html   (113 words)

 PHP Arrays 102 In our previous overview of PHP arrays we emphasized the associative arrays with their string keys and the ability to handle any sort of value including booleans, strings, numbers, other arrays, and class instances or objects. But associative arrays are also becoming a more common occurrence in PHP starting with database files with their fieldname keys and data field values or XML files with tagname as key and text element as value. So this tutorial will look at the most useful index array functions, then the functions to avoid if you are using associative arrays because they destroy associative keys, and then a few good associative array functions. www.theopensourcery.com /phparray102.htm   (1164 words)

 PHP: Arrays - Manual It also means that the internal array pointer used by current() and similar functions is reset. On array copying a deep copy is done of elements except those elements which are references, in which case the reference is maintained. For all of you having problems when using php arrays in an HTML form input field name, and wanting to validate the form using javascript for example, it is much easier to specify an id for the field as well, and use this id for validation. www.php.net /manual/en/language.types.array.php   (4229 words)

 Perl tutorial: Associative arrays To define an associative array we use the usual parenthesis notation, but the array itself is prefixed by a % sign. An associative array can be converted back into a list array just by assigning it to a list array variable. Associative arrays do not have any order to their elements (they are just like hash tables) but is it possible to access all the elements in turn using the keys function and the values function: www.comp.leeds.ac.uk /Perl/associative.html   (536 words)

 Perl Basics: Associative Arrays Associative arrays are yet another way to store variables in a group. This indicates that what follows is an associative array, so the interpreter knows to use the keys and values, rather than assign index numbers to each string. Associative arrays are very handy when you are trying to get input from forms on a web page. www.pageresource.com /cgirec/ptut12.htm   (492 words)

 eXtropia.com | Tutorials | Introduction to Web Programming | Accessing an Associative Array When accessing an associative array using a scalar variable as a key, you should not surround the key with single quotes because the scalar variable will not be interpolated. Accessing an associative array is one of the most basic CGI functions and is at the heart of the ReadParse routine in cgi-lib.pl that creates an associative array from the incoming form data. The "key" of the associative array generated by ReadParse will be "full_name" and the "value" will be whatever the client typed into the text box. www.extropia.com /tutorials/perl_cgi/perl_access_associative_array.html   (242 words)

 Ajaxian » Javascript Associative Arrays considered harmful He argues that since Arrays (the big "A" type) in JavaScript are meant to represent numerically indexed things, using them as an associative array violates the principle of least surprise. The other problem with using Arrays as associative arrays means you can no longer extend Array.prototype, which is what Prototype 1.5 does to great effect. Prototype did break Object associative arrays in 1.4 with additions to Object.prototype, something that is fixed in 1.5 after much wailing and gnashing of teeth. ajaxian.com /archives/javascript-associative-arrays-considered-harmful   (1450 words)

 Day 10 -- Associative Arrays As with array variables, this tells the Perl interpreter that this is a single scalar item and is to be treated as such. Associative arrays can be used to simulate a wide variety of data structures, including linked lists, structures, trees, and databases. Use an associative array to store these numbers in a database, and then print out the names of all students with failing grades (less than 50) along with the subjects they failed. wwwacs.gantep.edu.tr /docs/perl-ebook/ch10.htm   (6532 words)

 PERL -- Array and List Functions Returns a 2 element array consisting of the key and value for the next value of an associative array, so that you can iterate over it. There is a single iterator for each associative array, shared by all each(), keys() and values() function calls in the program. Note that, since \$_ is a reference into the array value, it can be used to modify the elements of the array. www-2.cs.cmu.edu /People/rgs/pl-exp-arr.html   (1284 words)

 Passing empty Associative Array ... ive tried setting parameter.value to a zero sized array of strings but this gives me a 3113 (session disconnected), followed by some ORA-12500 and i have to restart the database to be able to connect from anywhere (including bequeath!). In this case, each array passed into the procedure must have the same length. Even though they had been declared with the same length as the Line1 array, the values are all null. forums.oracle.com /forums/message.jspa?messageID=947090   (534 words)

 Painfully Obvious » Blog Archive » JavaScript “Associative Arrays” Considered Harmful var associative_array = new Array(); associative_array["one"] = "Lorem"; associative_array["two"] = "Ipsum"; associative_array["three"] = "dolor"; for (i in associative_array) { alert(i) }; Arrays are objects, just like anything else so I don’t see anything wrong with using them however the language allows you to. Arrays are great, Objects are great, Prototype is great, it just all makes sense if you sit down and read a little before writing lines and lines of code with a language you don’t understand. www.andrewdupont.net /2006/05/18/javascript-associative-arrays-considered-harmful   (4128 words)

 Picking Up Perl - Associative Arrays (Hashes) Also known as hashes, associative arrays provide native language support for one of the most useful data structures that programmers implement--the hash table. Associative arrays, also frequently called hashes, are the third major data type in Perl after scalars and arrays. We have seen that each of the different native data types in Perl has a special character that identify that the variable is of that type. www.ebb.org /PickingUpPerl/pickingUpPerl_6.html   (797 words)

 The Associative Array Object's Help File The main difference is that an associative array uses string indices (called keys) wheras a normal array uses numeric indices. The Associative Array object's set-up dialog allows you to set the object's data to be global. This condition returns true if the array has been modified since the last time the a file was saved or loaded or since the last time the array was cleared. www.engr.uconn.edu /~mjg01f01/bumderland/objects/assarray.html   (4031 words)

 PHP: Array Functions - Manual Arrays are essential for storing, managing, and operating on sets of variables. Please see the Arrays section of the manual for a detailed explanation of how arrays are implemented and used in PHP. is used with array_change_key_case() and is used to convert array keys to upper case. us2.php.net /array   (2477 words)

 array See also associative array, matrix, huge sparse array. An external index, such as a hash table or inverted index may help make an array search quicker and speed overall processing if the array is not changed often. If the array is kept sorted, a binary search or interpolation search is faster. www.nist.gov /dads/HTML/array.html   (237 words)

 Using an Associative Array An associative array (also called map or dictionary) is an array for which the index does not have to be an integer. One serves as the key and the other is the associated value. The map<> container is an example of an associated array. www.devx.com /tips/Tip/5659   (221 words)

 Day 10 -- Associative Arrays Although array variables are useful, they have one significant drawback: it's often difficult to remember which element of an array stores what. Associative arrays can be used to simulate a wide variety of data structures, including linked lists, structures, trees, and databases. Use an associative array to store these numbers in a database, and then print out the names of all students with failing grades (less than 50) along with the subjects they failed. www.ethiopiawebdesign.com /perl/ch10.htm   (6532 words)

 PHP course: Associative Arrays In the last section when we looked at sequential arrays, we were treating arrays much the same as they are in many other programming languages. In fact PHP arrays are really quite sophisticated, and allow you to do all kinds of things not possible in other languages. Whhen an array is 'keyed' in this way it is said to be an associative array. www.hypermedic.com /php/arrays3.htm   (897 words)

 Docs For Class MDB_manager an associative array that contains the definition of the changes that are meant to be applied to the database structure. an associative array that the defines the text string values that are meant to be used to replace the variables that are used in the schema description as defined for the MDB_manager::ParseDatabaseDefinitionFile function. an associative array that the defines the text string values that are meant to be used to replace the variables that are used in the schema description. pear.php.net /package/MDB/docs/0.9.6/MDB/MDB_manager.html   (758 words)

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