Variables, Types & Collections

Question 1

Method to flatten an array (depth 0+ or infinity for entire array)

Answer 1

.flat(depth)

.flat(Infinity) / .flat(1) / .flat(0)

Question 2

Static array method to create an array from an array like collection

Answer 2

Array.from(arrayLikeCollection)

Question 3

Create an array from arguments provided

Answer 3

Array.of(arguments)

Question 4

Creates an array of the length specified by the argument

Answer 4

Array constructor

Question 5

Which date methods can be used to display the time in the Coordinated Universal Time (UTC) zone?

Answer 5

toUTCString() provides a more human-readable format

and

toISOString()

Question 6

Which date method returns the time in the users time zone with a plus or minus offset relation to UTC?

Answer 6

toString()

Question 7

Which date method returns only the date portion and not the time?

Answer 7

toDateString()

Question 8

How many falsy values are there in JavaScript and what are they?

Answer 8

There are 8 falsy values and they are false, 0, -0, 0n, ‘’ (empty string), null, undefined, and NaN (Not a Number).