# 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*

*https://www.shiksha.com/online-courses/articles/javascript-data-types-with-examples/#sum*