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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

Peeking the element from the top of the stack

Now, let's implement additional helper methods in our class. If we would like to know what the last element added to our stack was, we can use the peek method. This method will return the item from the top of the stack:

peek() {  return this.items[this.items.length - 1];} 

As we are using an array to store the items internally, we can obtain the last item from an array using length - 1 as follows:

For example, in the previous diagram, we have a stack with three items; therefore, the length of the internal array is 3. The last position used in the internal array is 2. As a result, the length - 1 ...

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Learning JavaScript Data Structures and Algorithms

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Publisher Resources

ISBN: 9781788623872Supplemental Content