Dates and Numbers

Question 1

How to convert string to a number?

Answer 1

use Number(‘20’);

or use +’20”

Question 2

I need to remove special characters from my int?

Answer 2

use Number.parseInt(‘23z’);

This works only when the number is beginning.

Question 3

How to check is a value is a number?

Answer 3

use Number.isNan(‘234’);

but better to use isFinite() because is NaN returns values otehr than true or false like infinite

Question 4

How to find square root of a number in JS?

Answer 4

use Math.sqrt();

Question 5

How to find max / min of numbers?

Answer 5

Math.max(1,2,3,4,5);

Question 6

How to generate random values?

Answer 6

Math.trunc(Math.randon() * 6) + 1

this will generate random values between 1 and 6

Question 7

What are numeric separators?

Answer 7

we can add underscores(_) for better readability.

Example, const h = 345_455;

We cannot convert to string. Also, we cannot add _ next to . and at the end/beginning of the number.

Question 8

What is the max int value in JS?

Answer 8

Interger value is 64 bit, in which 53 bits are used.

Number.MAX_SAFE_INTEGER

2 ** 53-1

Question 9

What is BigInt?

Answer 9

Number which can be bigger than MAX_SAFE_INTEGER.

example, const i = 3543264563674567465467n
we can also use BigInt();

Question 10

How to create a date?

Answer 10

const now = new Date()

also, 
const d = new Date('August 20, 2021')

A few methods - d.ToFullYear()

d. Month()
etc. .

Question 11

How to L10 the dates in JS?

Answer 11

Intl.DateTimeFormat(‘en_US’).fomat(date.now());

Question 12

How to L10 numbers in JS?

Answer 12

Intl.NumberFomat(‘en_US’).fomat(12345);