Arrays & Array Methods

This video tutorial covers the basics of arrays in JavaScript, including how to create arrays with different data types, explore their properties and methods, and perform various mutations. It also delves into sorting arrays and using the find method with custom functions. The tutorial provides practical examples and explanations to help understand these concepts.

What is the most popular way to create an array in JavaScript?

• Using angle brackets <>

• Using square brackets []

• Using parentheses ()

• Using curly braces {}

How can you check if a variable is an array in JavaScript?

• Using the typeof operator

• Using the Array.isArray() method

• Using the instanceOf operator

• Using the isArray() function

What is the index of the first element in a JavaScript array?

• It depends on the array

• 1

• 0

• -1

Which method would you use to add an element to the end of an array?

• shift()

• pop()

• push()

• unshift()

What does the splice() method do in an array?

• Sorts the elements of an array

• Removes or replaces existing elements and/or adds new elements

• Removes elements from the end of an array

• Adds elements to the end of an array

How can you reverse the order of elements in an array?

• Using the sort() method

• Using the reverse() method

• Using the concat() method

• Using the push() method

What is the purpose of the compare function in sorting numbers?

• To sort numbers in alphabetical order

• To sort numbers based on their first digit

• To sort numbers randomly

• To sort numbers in ascending or descending order

Which method would you use to combine two arrays into one?

• concat()

• splice()

• push()

• unshift()

What does the find() method do in an array?

• Finds the first element that satisfies a testing function

• Finds all elements that match a given value

• Finds the last element in the array

• Finds the index of a given element

What will the find() method return if no elements satisfy the testing function?

• Undefined

• The last element in the array

• An empty array

• Null