Final answer:
The difference between VAR and let in JavaScript is that VAR is function-scoped and allows variable hoisting and redeclaration, while let is block-scoped, not hoisted, and does not permit redeclaration within the same scope.
Step-by-step explanation:
Differences Between VAR and let in JavaScript
The difference between VAR and let in JavaScript revolves around variable scoping, hoisting, and redeclaration. Both are used to declare variables, but they behave differently.
VAR is function-scoped, meaning if it's defined within a function, it can only be accessed within that function. It is also hoisted, which means that it can be used before it's been declared. Furthermore, variables declared with VAR can be redeclared within the same scope.
In contrast, let is block-scoped, giving it a smaller scope: it can only be accessed within the block (denoted by curly braces {}) it's defined in. let is not hoisted, so the variable cannot be used before declaration. Additionally, let does not allow for redeclaration in the same scope.
Considering these differences, let is generally recommended for better control and to prevent errors, whereas VAR's broader scope and hoisting behavior can be useful in some situations but might lead to unpredictable results if not used carefully.