Variables, data types, and operators

In JavaScript, a variable is used to store a value. Variables are declared using the "var", "let", or "const" keywords.

Data types in JavaScript include:

• Number: integer or floating-point
• String: a sequence of characters
• Boolean: either true or false
• Undefined: a variable that has been declared but has not been assigned a value
• Null: an intentional non-value
• Object: a collection of key-value pairs
• Symbol: a unique identifier

Operators are used to perform operations on values, such as arithmetic operations (+, -, *, /), comparison operations (>, >=, <, <=, ===, !==), and logical operations (&&, ||, !).

It's important to understand variables, data types, and operators in JavaScript as they form the foundation for writing JavaScript code.