Primitive Values

First of all what is Immutability?, in Object-Oriented and functional programming an immutable object (Unchangeable) is an object whose 
state cannot be modified after it's created. 

Now what is exactly a primitive value, they are any immutable value that directly represents the lowest level of that language, all 
types except objects define immutable values.

There are seven primitive values in JS:

Boolean:
  Represents a logical entity that can have two values, true or false. Boolean conditionals are often used to decide which sections
  of code to execute (such as in if statements) or repeat (such as in for loops).
  
      if (boolean conditional) {
       // code to execute if the conditional is true
      }

Null:
  Represents the intentional absence of any object value, and is treated as falsy* for boolean operations.
  
  *A falsy value is a value that is considered false when encountered in a boolean context.
  
Undefined:
  The undefined type is the one that has an undefined value by default, when a variable is declared but not initialized.
  
Number:
  Number type is a double precision that is usually occupying 64 bits in computer memory, it represents a wide dynamic 
  range of numeric values between -(2^53 − 1) and 2^53 − 1. The number type has three symbolic values +Infinity, -Infinity
  and NaN
  
  To check for the largest available value or smallest available value within ±Infinity, you can use the constants 
  Number.MAX_VALUE or Number.MIN_VALUE.
  
BigInt:
  
String:
  
Symbol: