When it comes to declaring variables in JavaScript, we often have two options: let and const. But which one should you choose? In this article, we’ll explore the differences between let and const and discuss when to use each.
By default, I always prefer using const for my variable declarations. Why? Because const ensures that the value of the variable cannot be reassigned. As a developer, I always strive to use the approach that poses the least risk. With the multitude of potential problems that can arise in programming, it’s important to exercise caution.
In essence, the more power we grant to something, the greater the responsibility assigned to it. And in most cases, I prefer to minimize this responsibility. While this may be a subjective preference, it works well for me.
If I use let to declare a variable, I am allowing it to be reassigned:
let number = 0;
number = 1;
There are situations where reassigning variables is necessary, and let is perfect for such cases. However, in approximately 80% of the situations, I do not want this option to be available. I want the compiler (or interpreter in JavaScript’s case) to flag any attempt to reassign the variable as an error.
That’s why I default to using const every time I declare a variable, reserving let only for situations where reassignment is required.
Choosing between let and const ultimately depends on your specific needs and preferences. However, following this approach can help minimize potential issues and improve the overall robustness of your code.