Skip to Content
Learning JavaScript Data Structures and Algorithms - Third Edition
book

Learning JavaScript Data Structures and Algorithms - Third Edition

by Loiane Avancini
April 2018
Beginner to intermediate content levelBeginner to intermediate
426 pages
10h 19m
English
Packt Publishing
Content preview from Learning JavaScript Data Structures and Algorithms - Third Edition

Verifying whether a key exists in the dictionary

The first method we will implement is the hasKey(key) method. We will implement this method first because it will be used in other methods, such as set and remove. We can see its code as follows:

hasKey(key) {  return this.table[this.toStrFn(key)] != null;}

JavaScript only allows us to use strings as the key/property of objects. In case we have a complex object passed as a key, we will need to transform it into a string. For this reason, we will always invoke the toStrFn function. In case there is a value pair for the given key (a position in the table not null or undefined), then we return true, otherwise, we return false.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Learning JavaScript Data Structures and Algorithms

Learning JavaScript Data Structures and Algorithms

Loiane Avancini

Publisher Resources

ISBN: 9781788623872Supplemental Content