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Learning JavaScript Data Structures and Algorithms

You're reading from   Learning JavaScript Data Structures and Algorithms JavaScript Data Structures and algorithms can help you solve complex development problems – learn how by exploring a huge range of JavaScript data types

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Product type Paperback
Published in Oct 2014
Publisher Packt
ISBN-13 9781783554874
Length 218 pages
Edition 1st Edition
Languages
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Author (1):
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Loiane Avancini Loiane Avancini
Author Profile Icon Loiane Avancini
Loiane Avancini
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Toc

Dictionaries


As you have learned, a set is a collection of distinct elements (non-repeated elements). A dictionary is used to store [key, value] pairs, where the key is used to find a particular element. The dictionary is very similar to a set; a set stores a [key, key] collection of elements, and a dictionary stores a [key, value] collection of elements. A dictionary is also known as a map.

In this chapter, we will cover some examples of the use of the dictionary data structure in the real world: a dictionary itself (the words and their definitions), and an address book.

Creating a dictionary

Similar to the Set class, ECMAScript 6 also contains an implementation of the Map class—also known as a dictionary.

Note

You can check out the details of the ECMAScript 6 Map class implementation at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map (or http://goo.gl/dm8VP6).

The class we are going to implement in this chapter is based on the Map implementation of ECMAScript...

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