JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - What Is the IndexOf Method in JavaScript

The video tutorial introduces the JavaScript method 'indexOf', explaining its utility in searching for elements within arrays. It covers the complexity and mutability of arrays, demonstrating how 'indexOf' can efficiently locate an element's position or return -1 if the element is absent. The tutorial emphasizes understanding array data structures and their dynamic nature, providing practical examples of using 'indexOf' in coding scenarios.

What is the primary purpose of the 'indexOf' method in JavaScript?

• To add new elements to an array

• To remove elements from an array

• To find the index of a specific element in an array

• To sort elements in an array

Why can arrays in JavaScript become complex?

• They can grow large and their content can change over time

• They are always one-dimensional

• They can only store numbers

• They cannot store objects

What does the 'indexOf' method return if the element is not found in the array?

• undefined

• null

• -1

• 0

Which of the following is true about the return value of 'indexOf' when an element is found?

• It returns a negative number

• It returns a string

• It returns a decimal number

• It returns a whole number greater than -1

What parameter does the 'indexOf' method take?

• The type of the array

• The length of the array

• The element to search for

• The index of the element