Modern Web Design with HTML5, CSS3, and JavaScript - JavaScript Array Methods – Advanced

The video tutorial covers various array methods in JavaScript, focusing on sorting, filtering, and indexing. It explains how to use the sort method with and without a compare function, demonstrates filtering arrays to create new ones based on conditions, and explores methods like indexOf, includes, and lastIndexOf to find elements within arrays. The tutorial emphasizes understanding these methods to effectively manage and manipulate array contents.

Which method is used to loop through each item in an array?

• reduce

• filter

• forEach

• map

What does the sort method do to an array?

• Sorts the array in place

• Converts all elements to strings

• Returns a new sorted array

• Removes duplicates

How can you sort an array of numbers correctly?

• Using sort() directly

• Using a compare function

• Converting numbers to strings

• Using reverse()

What is the purpose of the compare function in sorting?

• To filter elements

• To reverse the array

• To sort numbers numerically

• To find duplicates

Which method creates a new array with elements that pass a test?

• filter

• map

• reduce

• forEach

How can you filter out non-numeric values from an array?

• Using map()

• Using filter() with a condition

• Using reduce()

• Using sort()

What does the indexOf method return?

• The length of the array

• The last index of an element

• The first index of an element

• A boolean value

Which method checks if an array includes a specific value?

• filter

• find

• includes

• indexOf

What does the lastIndexOf method do?

• Finds the first index of an element

• Sorts the array

• Finds the last index of an element

• Checks if an element exists

How can you determine if an array contains a specific value?

• Using indexOf()

• Using includes()

• Using filter()

• Using map()