Modern JavaScript from the Beginning - Second Edition - Array Challenges

The video tutorial presents two coding challenges focused on array manipulation in JavaScript. The first challenge involves creating and mutating an array from numbers 1 to 5 into 6 to 0 using methods like reverse, push, and unshift. The second challenge requires concatenating two arrays while removing duplicate elements, using methods such as concat, slice, and splice. The instructor provides solutions and encourages viewers to attempt the challenges independently, highlighting multiple approaches to achieve the same result.

What is the main goal of the first challenge presented in the video?

• To create an array with numbers 1 to 5 and then double each number.

• To create an array with numbers 6 to 0 and then sort it.

• To create an array with numbers 1 to 5 and then mutate it to 6 to 0.

• To create an array with numbers 1 to 5 and then reverse it.

Which method is used to add an element to the beginning of an array?

• pop

• push

• shift

• unshift

What is the purpose of the 'reverse' method in the first challenge solution?

• To remove the last element of the array.

• To sort the array in ascending order.

• To add a new element to the end of the array.

• To reverse the order of elements in the array.

In the second challenge, what is the main task to achieve with the two arrays?

• To split them into smaller arrays.

• To concatenate them and remove the duplicate 5.

• To merge them and sort in descending order.

• To find the intersection of both arrays.

Which method can be used to remove an element from a specific index in an array?

• slice

• concat

• splice

• map

What does the 'concat' method do in the context of the second challenge?

• It removes duplicate elements from an array.

• It reverses the order of elements in an array.

• It sorts the array in ascending order.

• It combines two arrays into one.

Which operator can be used as an alternative to 'concat' for merging arrays?

• The filter operator

• The map operator

• The rest operator

• The spread operator