JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Filter Method / 071

The video tutorial explores various methods related to arrays, focusing on the filter method. It explains how arrays can store multiple elements and maintain their sequence. The tutorial provides detailed examples of using the filter method to select elements based on conditions, ensuring the original array remains unchanged. It also covers advanced examples, including filtering even and odd numbers and working with objects in arrays. The tutorial emphasizes understanding the logic behind the filter method and encourages practice to master the concept.

Which of the following methods is used to apply a function to each element in an array and return a new array?

• filter

• map

• reduce

• sort

What does the filter method return when a condition is not met for an element?

• An error

• The element itself

• False

• True

When using the filter method, what happens to the original array?

• It is reversed

• It remains unchanged

• It is deleted

• It is modified

In the filter method, what is the purpose of the callback function?

• To remove duplicates

• To sort elements

• To check conditions for each element

• To add elements

How can you optimize a filter function using arrow functions?

• By using traditional functions

• By removing parentheses and curly braces

• By using multiple lines

• By adding more parameters

What condition would you use to filter even numbers from an array?

• num % 2 !== 0

• num > 0

• num % 2 === 0

• num < 0

Which logical operator can be used to reverse a condition in JavaScript?

• !

• ==

• ||

• &&

When filtering objects in an array, what is a common property to check?

• Name

• Date

• ID

• Rating

What is the result of filtering an array of objects based on a property value?

• A boolean value

• A single object

• The original array

• A new array of objects

In the context of filtering movies, what does a rating greater than 6 signify?

• The movie is not popular

• The movie is highly rated

• The movie is old

• The movie is new