What is the difference between var, let, and const in JavaScript?

In JavaScript, var, let, and const are used for variable declarations, but they each have distinct behaviors regarding scoping. The correct answer highlights that var is function-scoped while let is block-scoped.

Function scoping means that a variable declared with var is accessible throughout the entire function in which it is defined, regardless of where it is located within that function. This can lead to unexpected behavior, particularly in loops or conditional statements, where variables might still be accessible outside their intended scope.

On the other hand, let introduces block scoping, meaning that a variable declared with let is only accessible within the nearest enclosing block, such as a loop, if statement, or any pair of curly braces {}. This helps prevent issues related to variable overwriting and enhances the predictability of code.

const is also block-scoped and is used to declare variables that cannot be reassigned. Both let and const were introduced in ECMAScript 6 (ES6) to address the drawbacks of var, providing stricter control over variable visibility and lifecycle which can help developers write cleaner and more maintainable code. The statement emphasizes the