JS >data type> cheatsheet

JavaScript>data type>cheatsheet

what is a data type?
data type is basically specifies what kind of data can be stored and manipulated with the program.

7 types of data types as listed below:

Primiative data types

1. What are strings?
   Strings are a primitive data type. They are any grouping of characters surrounded by single quote ' or double quotes ".
   • letters
   • spaces
   • numbers
   • symbols
2. What are numbers?
   Numbers are a primitive data type.
   They include the set of all integers and floating point numbers.

   examples)

   let amount = 6;
   let price = 4.99;

3. What is a boolean?
   true or false
4. What is the difference between null and undefined?
   Null is a primitive data type.
   It represents the intentional absence of value.
   It is represented as null.

   example)

   let x = null;

   Undefined is a primitive JavaScirpt value that represents lack of defined value.
   Variables that are declared but not initialized to a value will take the value undefined. example)

   var a;
   console.log(a);  // Output: undefined

===================== ... to be continued...

5. What is an object?

6. What is an array?

7. What is a function?