JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Sort Method / 075

The lecture covers the JavaScript sort method, highlighting its destructive nature and issues with character-based sorting. It introduces the concept of a custom compare function to address these issues, providing examples with numbers and strings. The lecture also demonstrates sorting objects by a specific property, like rating, and concludes with best practices for using sort and compare functions effectively.

What is a key characteristic of the sort method in JavaScript?

• It creates a new sorted array.

• It sorts numbers based on their numerical value by default.

• It is a non-destructive method.

• It changes the original array.

Why might the default sort method not work as expected with numbers?

• It sorts numbers based on their string representation.

• It only sorts numbers in descending order.

• It requires a custom function to sort strings.

• It can only sort arrays with less than 10 elements.

What is the purpose of a custom compare function in sorting?

• To create a new array with sorted elements.

• To define how two elements should be compared.

• To sort only string arrays.

• To sort arrays in reverse order.

In a custom compare function, what does a negative return value indicate?

• The elements are equal.

• The second element should come before the first.

• The first element is larger than the second.

• The first element should come before the second.

Which of the following is NOT a valid return value for a custom compare function?

• Zero

• Positive number

• Negative number

• String

How can you sort an array of objects by a specific property?

• By converting the objects to strings first.

• By using the map function before sorting.

• By using the default sort method.

• By using a custom compare function that accesses the property.

What is the result of comparing two elements with equal values in a custom compare function?

• The elements are swapped.

• The elements remain in their original order.

• The elements are removed from the array.

• The elements are duplicated.

What happens if you compare two elements and the result is zero in a custom compare function?

• The elements are duplicated.

• The elements are considered equal and remain in their order.

• The elements are swapped.

• The elements are removed from the array.

What is a recommended practice when writing arrow functions with a single line of code?

• Always include curly braces and a return statement.

• Remove curly braces and the return statement.

• Include parentheses around the single line.

• Use a for loop instead.

How can you reverse the order of a sorted array?

• By using the map method.

• By using a custom compare function with reversed logic.

• By sorting the array again.

• By using the reverse method.