Table of Contents
- Declaring Variables
- Type Coercion and Conversion
- Best Practices
2. Declaring Variables
2.1. Using `
2.2. Using `
2.3. Using `
3.1. Primitive Types
- Number: Represents numeric values, including integers and floating-point numbers.
- String: Represents a sequence of characters, enclosed in single or double quotes.
- Boolean: Represents a true or false value.
- Undefined: Represents a variable that has not been assigned a value.
- Null: Represents an intentional absence of any value.
- Symbol: Represents a unique and immutable identifier, useful for object property keys.
3.2. Reference Types
Reference types are more complex data structures, such as objects, arrays, and functions, that have properties and methods. The most common reference type is the Object.
4. Type Coercion and Conversion
4.1. Implicit Type Coercion
4.2. Explicit Type Conversion
You can explicitly convert data types using various built-in methods, such as Number(), String(), parseInt(), and parseFloat().
5. Best Practices
- Use let and const instead of var for variable declarations, as they provide better scoping and functionality.
- Choose meaningful and descriptive variable names for better code readability and maintainability.
- Use strict comparison operators (=== and !==) to avoid unexpected results from type coercion.
- When dealing with numbers and strings, use built-in methods for explicit type conversion when necessary.
- Keep your code modular and organized by using objects and arrays to store complex data structures.