Which is NOT considered as javascript number data type

What is the result of this statement?

console.log('Boolean(10) is ' + Boolean(10));

var motorcyle =["honda,"" kawasaki"," yamaha"];

this line of statement is an example of data type

let student;

console.log(student);

the variable student is an example of data type

This data type value is treated as special which represents empty or unknown. Which keyword is being used to characterize this variable?

let mobilePhone = {

name: 'iphone',

model: '15',

price: 'Php 56,990' };

This js code is an example of data type

let o = "Ocean" + 5 + 3;

console.log(o);

The result is:

When you code and run this line of code

console.log(typeof 123)

will result into

This data type is very useful when a programmer wants to check the condition while validating something in the script.