JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Map Method / 072

The video tutorial explains the map method in JavaScript, starting with a basic introduction and moving on to examples with numbers and conditional logic. It then covers a more complex example involving objects and tax calculations, emphasizing the importance of returning updated elements and understanding reference types.

What is the primary function of the map method in JavaScript?

• To transform each element in an array and return a new array

• To filter elements based on a condition

• To find a specific element in an array

• To sort elements in an array

How does the map method differ from the filter method?

• Map method selects elements, filter method transforms elements

• Both methods perform the same function

• Map method transforms elements, filter method selects elements

• Map method is used for sorting, filter method is used for searching

In the simple example, what operation is performed on each element of the array?

• Each element is multiplied by 2

• Each element is divided by 2

• Five is added to each element

• Each element is subtracted by 5

How does the map method handle elements that do not meet a specified condition?

• It removes them from the array

• It duplicates them

• It returns them unchanged

• It sets them to null

What happens if you do not return a value for each element in the map method?

• The element will be removed from the new array

• The map method will throw an error

• The element will be set to undefined in the new array

• The map method will skip the element

What is the result of using the map method on an array of numbers with a condition to add five only if the number is greater than 30?

• Numbers less than 30 are increased by five

• Numbers greater than 30 are increased by five

• No numbers are changed

• All numbers are increased by five

What is the purpose of using the map method with objects in an array?

• To delete objects from the array

• To update object properties without altering the original object

• To find a specific object in the array

• To sort objects based on a property

What is the result of adding a tax to the price in the map method example with objects?

• The price is increased by a percentage of the original price

• The price is increased by a fixed amount

• The price remains the same

• The original price is reduced

What is a key takeaway about the map method from the conclusion?

• It is limited to filtering elements

• It can only be used with numbers

• It is only useful for sorting arrays

• It allows for flexible transformations on array elements

Which of the following is NOT a feature of the map method?

• It creates a new array with transformed elements

• It modifies the original array

• It can apply a function to each element

• It can be used with arrays of objects