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A map, sometimes referred to as a dictionary, consists of a key/value pair. The key is used to order the sequence, and the value is somehow associated with that key. For example, a map might contain keys representing every unique word in a text and values representing the number of times that word appears in the text.
Thus, when iterating through it, a map object returns keys in order of insertion. The following demonstrates enumeration using a for-loop: // loop through the collection and display each entry. for ( const [ name , number ] of phoneBook ) { console . log ( `Phone number for ${ name } is ${ number } ` ); }
The next example illustrates a PHP class that implements the Traversable interface, which could be wrapped in an IteratorIterator class to act upon the data before it is returned to the foreach loop. The usage together with the MYSQLI_USE_RESULT constant allows PHP scripts to iterate result sets with billions of rows with very little memory usage.
foreach loops are almost always used to iterate over items ... Here is a forward iteration over the elements of "My_Map" selecting only elements where the keys are in ...
Hashing is an example of a space-time tradeoff. If memory is infinite, the entire key can be used directly as an index to locate its value with a single memory access. On the other hand, if infinite time is available, values can be stored without regard for their keys, and a binary search or linear search can be used to retrieve the element.
Map functions can be and often are defined in terms of a fold such as foldr, which means one can do a map-fold fusion: foldr f z . map g is equivalent to foldr (f . g) z. The implementation of map above on singly linked lists is not tail-recursive, so it may build up a lot of frames on the stack when called with a large list. Many languages ...
Image source: The Motley Fool. Pinterest (NYSE: PINS) Q4 2024 Earnings Call Feb 06, 2025, 4:30 p.m. ET. Contents: Prepared Remarks. Questions and Answers. Call ...
In object-oriented programming, the iterator pattern is a design pattern in which an iterator is used to traverse a container and access the container's elements. The iterator pattern decouples algorithms from containers; in some cases, algorithms are necessarily container-specific and thus cannot be decoupled.