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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

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We have two search options: the indexOf method, which returns the index of the first element that matches the argument passed, and lastIndexOf, which returns the index of the last element found that matches the argument passed. Let's go back to the numbers array that we were using before:

console.log(numbers.indexOf(10));  
console.log(numbers.indexOf(100)); 

In the previous example, the output in the console would be 9 for the first line and -1 (because it does not exist in our array) for the second line. We can get the same result with the following code:

numbers.push(10);  
console.log(numbers.lastIndexOf(10)); 
console.log(numbers.lastIndexOf(100)); 

We added a new element with the value 10, so the second line will output 15 (our ...

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Learning JavaScript Data Structures and Algorithms

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Loiane Avancini

Publisher Resources

ISBN: 9781788623872Supplemental Content