JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Query Selector / 046

This video tutorial covers the use of query selector and query selector all in JavaScript for DOM manipulation. It explains how to select elements using tags, classes, and IDs, and introduces the concept of node lists. The tutorial also discusses the use of CSS selectors for more precise element selection and demonstrates how to iterate over node lists using JavaScript.

What is the primary focus of the lecture on query selectors?

• Creating HTML documents

• Manipulating the DOM using JavaScript

• Manipulating CSS styles

• Designing navigation bars

What does the querySelector method return?

• An array of elements

• The first matching element

• A string representation of the element

• All matching elements

Which method would you use to select all elements that match a specific query?

• getElementById

• getElementsByClassName

• querySelector

• querySelectorAll

What is a NodeList?

• A single HTML element

• A JavaScript object

• A list of nodes similar to an array but with limitations

• An array of elements

How can you refine your element selection using CSS selectors?

• By using only tag names

• By using JavaScript functions

• By using inline styles

• By combining tag names with class or ID selectors

What is the advantage of using querySelectorAll over querySelector?

• It works with older browsers

• It is easier to use

• It returns all matching elements

• It is faster

How can you select a specific paragraph inside a division using CSS selectors?

• By using the division's class name

• By using the paragraph's ID

• By combining the division and paragraph selectors

• By using inline styles

Which method allows you to iterate over a NodeList?

• reduce

• map

• filter

• forEach

What is a key limitation of a NodeList compared to an array?

• NodeLists cannot be indexed

• NodeLists do not support forEach

• NodeLists are not iterable

• NodeLists do not support all array methods

What is the purpose of using a callback function with forEach on a NodeList?

• To filter elements in the NodeList

• To convert the NodeList to an array

• To iterate over each element in the NodeList

• To modify the NodeList