Modern Web Design with HTML5, CSS3, and JavaScript - JavaScript Array Methods – Advanced

This video tutorial covers various array methods in JavaScript, including sorting, filtering, and finding elements. It explains how to use the sort method with and without a compare function, how to filter arrays to create new ones based on specific conditions, and how to find elements using indexOf, includes, and lastIndexOf methods. The tutorial emphasizes the importance of understanding these methods to effectively manage and manipulate array contents.

Which of the following methods is used to loop through each item in an array?

• find

• forEach

• slice

• shift

What does the sort method do to an array?

• Returns a new sorted array

• Sorts the array in place

• Removes duplicates from the array

• Converts all elements to strings

How can you perform a numeric sort on an array?

• Using a compare function

• Using the reverse method

• Using the default sort method

• Using the slice method

How can you reverse the sort order using the compare function?

• By using a - b

• By using sort()

• By using b - a

• By using reverse()

What is the purpose of the filter method?

• To create a new array with elements that pass a test

• To reverse the order of an array

• To sort an array

• To find the index of an element

What is a key feature of the filter method?

• It modifies the original array

• It finds the index of an element

• It returns a new array

• It sorts the array

Which method returns the first index of a specified element in an array?

• filter

• indexOf

• lastIndexOf

• includes

What does the includes method return?

• The index of an element

• A new array with filtered elements

• A boolean indicating if an element is present

• The last index of an element

What does the lastIndexOf method do?

• Finds the last index of an element

• Checks if an element is included

• Finds the first index of an element

• Filters elements based on a condition

Which method would you use to check if an array contains a specific value?

• sort

• includes

• filter

• indexOf