JavaScript data Types.
--
The main JavaScript data types can be divided into two parts:
One is primitive types and One is reference types.
There are primitive types
- String
- Number
- Boolean
- Undefined
- Null
- Symbol
Symbol:
Symbol Es6 has been added to the premitives
examples:
let customerName = ‘Jhon Doe’; // string literal
let firstName = String (‘Jhon’); // factory function
let lastName = new String (‘Doe’); // constructor function
let price = 24.45; // Number Literal
let unit = 3; // Number Literal
let isNewCustomer = false; // Boolean Literal
let discount = null;
Checking a Type:
String:
let customerName = ‘Jhon Doe’; // string literal
typeof customerName; // “string”
let firstName = String (‘Jhon’); // factory function
typeof firstName; // “string”
Object:
let lastName = new String (‘Doe’); // constructor function
typeof lastName; // “object”
Number:
let price = 24.45; // Number Literal
let unit = 3; // Number Literal
Boolean:
let customerName = ‘Jhon Doe’; // string literal
let price = 24.45; // Number Literal
let unit = 3; // Number Literal
let isNewCustomer = false; // Boolean Literal
let discount = null;
typeof isNewCustomer; // “boolean”
Null:
let discount = null;
typeof discount; // ”object”
Undefined:
let customerName = ‘Jhon Doe’; // string literal
let price = 24.45; // Number Literal
let unit = 3; // Number Literal
let isNewCustomer = false; // Boolean Literal
let discount = null;
typeof firstName; // “undefined”
