JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Modifying Arrays and Unshift in JavaScript

This video tutorial introduces the concept of modifying arrays in JavaScript using the push and unshift methods. It explains the mutability of arrays, allowing elements to be added or removed dynamically. The tutorial provides a detailed explanation of how push adds elements to the end of an array, while unshift adds them to the beginning. A practical example using kitchen items demonstrates these methods in action, highlighting their syntax and functionality.

What are the two methods discussed for modifying arrays in JavaScript?

• map and filter

• splice and slice

• push and unshift

• pop and shift

Why is immutability important in programming?

• It reduces memory usage.

• It makes code easier to read.

• It helps in managing state changes effectively.

• It allows for faster execution of code.

What does the push method do in an array?

• Adds elements to the end of an array

• Removes elements from the end of an array

• Adds elements to the beginning of an array

• Removes elements from the beginning of an array

How does the unshift method modify an array?

• It removes elements from the beginning of an array.

• It adds elements to the beginning of an array.

• It removes elements from the end of an array.

• It adds elements to the end of an array.

In the kitchen items example, what item was added first using the unshift method?

• Cabinet

• Knife

• Plates

• Fork

What is the initial content of the kitchen items array before any modifications?

• Knife, Plates, Cabinet

• Plates, Cabinet, Fork

• Cabinet, Fork, Knife

• Fork, Knife, Plates

What is the purpose of using console.log in the kitchen items example?

• To sort the items in the array

• To display the current items in the array

• To add new items to the array

• To remove items from the array