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Data Types in JavaScript

What are Data Types?

Imagine you have boxes. You can put different things in them: apples, books, toys. Data types in JavaScript are like those boxes. They tell the computer what kind of information is stored inside.

Types of Data Types
  1. Number:
    • Purpose: Represents numerical values (like whole numbers and decimals).
    • Examples: 10, 3.14, -5, Infinity, -Infinity, NaN (Not a Number).
  2. String:
    • Purpose: Represents text.
    • Syntax: Enclosed in single quotes (‘) or double quotes (“).
    • Examples: ‘Hello’, “JavaScript”, “123”, ” “(empty string).
  3. Boolean:
    • Purpose: Represents a true or false value.
    • Value: true, false
  4. Null:
    • Purpose: Represents the intentional absence of a value.
    • Value: null
  5. Undefined:
    • Purpose: Represents a variable that has been declared but hasn’t been assigned a value yet.
  6. Object:
    • Purpose: A collection of key-value pairs.
    • Example: 
    • let person = {
         name:"Alice",
        age: 30
      };
  7. Array:
    • Purpose: An ordered list of values.
    • Example: [1, 2, 3], [“apple”, “banana”, “orange”]
Why are Data Types Important?
  • Correct Operations: JavaScript knows how to work with different types of data. For example, you can add numbers, but you can’t directly add a number to a string.
  • Predictable Behavior: Understanding data types helps you write code that behaves as expected.
  • Debugging: If your code isn’t working as you expect, checking the data types of your variables can help you find the problem.
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