- Scope:
- Function-scoped: Variables declared with
var are scoped to the function in which they are declared.
- Not block-scoped:
var variables are not confined to the block in which they are declared (e.g., inside a loop or if statement).
- Hoisting:
var declarations are hoisted to the top of their scope (function or global) but are initialized with undefined.
- Re-declaration:
var allows re-declaration within the same scope.
- Global Object Property:
- When declared globally,
var variables become properties of the global object (window in browsers).