learning JavaScript

What are Data Types? A data type is an attribute associated with a piece of data that tells a computer how to interpret its value. In other words, it is information used to identify data stored in a variable.There are 6 Data types in JavaScript which include numbers, strings, booleans, objects, null and undefined.

1. Numbers

   A number is an integer that can be positive or negative, floating-point, exponential value.

   Ex.

   var = -5; //negative integer

   var a = 5; //positive integer

   var c = 5.5; //floating point

2. Strings

   A String is a group of characters enclosed with single/ double quotes or back ticks ( ' , " , ` ).

   Ex.

   var str1 = "Hello JavaScript"

   var str2 = 'Hello JavaScript'

3. Booleans

   A boolean is a logical data type to compare two values or condition if they are true or false.

   Ex.

   var a = 10;

   var b = 7;

   a==b //returns false

4. Objects

   In an object, we can store a collection of information inside an entry.

   Ex.

   var person1 = {

   first_name: "Jon",

   last_name: "Doe",

   age: 25

   }

5. null

   Null Is a value data type that can be used when we want to intentionally leave as an empty value when it run.

   Ex.

   Var a = null;

6. Undefined

   An undefined data type is any variable in which does not have a value. In other words, it is declared but not assigned with any value.

   Ex.

   var a;

Reference:

Flatiron frontend course work

shiksha.com/online-courses/articles/javascr..