JavaScript Statements Guide
Statements are the building blocks of JavaScript programs. They control the flow of execution, declare variables, and define program structure. The guide walks through Declarations, Control Flow, Error Handling. `let` declares block-scoped variables, `const` declares block-scoped constants (immutable binding), `var` declares function-scoped variables (avoid in modern code). `function`, `class`, `import`, `export` declare named entities. `if...else if...else` conditional execution. `switch...case` multi-way branching. `for`, `while`, `do...while` loops. `for...in` iterates keys, `for...of` iterates values. `break` and `continue` control loop flow. The guide is organized into 3 sections that build on each other, each pairing a prose explanation with runnable code. Browse the individual methods covered by this guide in the Statements category. Key APIs covered include if...else, for, for...of, while, switch, try...catch. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page.