JavaScript Basic Syntax

  JavaScript syntax defines the rules on how to write code. Knowing the basic rules is fundamental for programming in JavaScript.

Basic Syntax Rules

  Some of the most important rules in JavaScript are:

• JavaScript commands or statements end with a semicolon.
• Variables are declared with keywords like let, const, or var.
• Code must be properly indented to facilitate reading.
• Comments are written with // for single-line comments or /* comment */ for multi-line comments.

  The correct order of instructions and their proper structure are essential to avoid syntax errors.

Variables and Data Types

  In JavaScript, you can declare variables to store data. The most common data types are:

• String: Text strings, like "Hello, world!".
• Number: Integer or floating-point numbers, such as 10 or 3.14.
• Boolean: Logical values, true or false.
• Array: Ordered lists of values.
• Object: Collection of properties.

  In JavaScript, it's not necessary to specify the variable type when declaring it, as the language is dynamically typed.

Operators in JavaScript

  JavaScript offers several operators to work with data:

• +: Addition (for numbers) or concatenation (for text strings).
• -: Subtraction.
• *: Multiplication.
• /: Division.
• ==: Equality comparison (without considering the data type).
• ===: Strict equality comparison (considering the data type).

  It's important to understand how these operators behave to manipulate data correctly.

Control Structures

  In JavaScript, control structures allow executing code blocks under certain conditions or repeatedly:

• if: To execute a code block if a condition is met.
• for: To execute a code block repeatedly.
• while: To execute a code block while a condition is true.

  The correct use of control structures allows creating efficient and dynamic programs.