JavaScript Basics: How Variables and Operators Work Explained

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JavaScript offers three ways to declare variables: var (global-scoped and redeclarable), let (block-scoped and reassignable), and const (block-scoped and fixed). Operators in JavaScript span several categories, including arithmetic, assignment, comparison, logical, and unary types. A key behavioral difference exists with the addition operator, which concatenates mixed data types instead of computing a numeric result, while all other arithmetic operators return NaN when applied to incompatible types. Increment and decrement operators behave differently depending on whether they are applied before (pre) or after (post) a variable, affecting the value returned in that same expression. These foundational concepts are essential for writing and understanding JavaScript code at any level.

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