JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - What is the Filter Method in JavaScript

The video tutorial introduces the JavaScript filter method, explaining its utility in grouping ordered information by specific values. It covers the syntax and usage of the filter method, including examples with arrow functions and callback functions. The tutorial emphasizes the method's efficiency in filtering arrays and provides practical examples to illustrate its application.

What is the primary purpose of the filter method in JavaScript?

• To sort elements in an array

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

• To find the maximum value in an array

• To merge two arrays into one

Which of the following best describes how the filter method operates?

• It duplicates the original array

• It creates a new array with elements that meet a specific condition

• It modifies the original array

• It removes elements from the original array

What is a key feature of arrow functions when used with the filter method?

• They automatically sort the array

• They cannot access the 'this' keyword

• They use a different syntax but perform similarly to regular functions

• They require a named function

In the context of the filter method, what is a callback function?

• A function that reverses the array

• A function that is passed as an argument to filter each element

• A function that sorts the array

• A function that is called once the filter operation is complete

How can you filter an array to include only words longer than 5 characters using the filter method?

• Use the filter method with a condition checking word length

• Use a for loop to iterate and check each word

• Use the map method to transform the array

• Use the reduce method to accumulate results

What is the result of filtering an array of words to include only those longer than 5 characters?

• An empty array

• An array with words shorter than 5 characters

• An array with all words

• An array with words longer than 5 characters

Why is understanding the filter method important for real-world applications?

• It helps in sorting data

• It is necessary for data compression

• It is essential for data filtering and searching

• It is used for data encryption