Introduction to Const and Var
In JavaScript, variables can be declared using const, var, or let. Among these, const and var have significant differences in terms of scope, reassignability, and hoisting. Understanding these differences helps in writing better and more predictable code.

Scope Differences Between Const and Var
The scope of a variable determines where it can be accessed in the code. Const has block scope, meaning it is only accessible within the block in which it is defined. Var, on the other hand, has function scope, which means it can be accessed anywhere within the function it is declared in. This makes const safer for maintaining variable integrity.

Reassignability and Mutability
A variable declared with const cannot be reassigned once it has been initialized. This is useful for defining constants that should not change throughout the program. Var allows reassignment, which means its value can be updated anytime, potentially leading to unintended side effects in the code.

Hoisting Behavior
Both const and var are hoisted, but they behave differently. Var is hoisted and initialized with undefined, allowing it to be used before its declaration, though this can cause unexpected errors. Const is hoisted but not initialized, meaning it cannot be accessed before its declaration, preventing accidental usage before definition.

Best Practices for Using Const and Var
Const should be the default choice for declaring variables unless reassignment is needed. It improves code clarity and prevents unintended changes. Var should be avoided in modern JavaScript development due to its function scope and hoisting issues. Instead, let should be used when a variable needs to be reassigned javascript const vs var.

Conclusion
Understanding the differences between const and var is essential for writing efficient and bug-free JavaScript code. Using const ensures variables remain unchanged, providing better stability, while var should be avoided to prevent unexpected behavior.