JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Solution - Update Cryptocurrency Profile Data

The video tutorial guides viewers through creating and modifying a JavaScript function called 'crypto portfolio'. Initially, the function returns an array of cryptocurrencies. The tutorial then demonstrates how to log the function's output and modify it to return only specific elements using the 'slice' method. The instructor encourages viewers to practice and understand the slicing technique, emphasizing its power and utility in JavaScript programming.

What is the primary purpose of the 'crypto portfolio' function in the initial setup?

• To calculate the total value of cryptocurrencies

• To sort the cryptocurrencies alphabetically

• To filter out cryptocurrencies based on market cap

• To return the input array as it is

Which method is used to create a new array with only Bitcoin and Ethereum from the original array?

• slice

• filter

• concat

• splice

What is the index range used to slice out Bitcoin and Ethereum from the array?

• 2 to 4

• 1 to 3

• 0 to 2

• 0 to 1

Why is the 'slice' method considered powerful in array manipulation?

• It allows for easy duplication of array elements

• It can merge multiple arrays into one

• It can modify the original array directly

• It can sort the array in ascending order

What is the main takeaway regarding the use of 'slice' in this exercise?

• It is only useful for financial applications

• It is the only method to modify arrays

• It is primarily used for sorting arrays

• It is a versatile tool for array manipulation