muilibilal / zero_day

This is my first repository as a full-stack engineer

Hello👋🏼

I'm Bilal, A seasoned developer. I have few projects and I'm currently undergoing a SE course.

I'll be writing a few articles on some Js concepts which would be helpful to beginners

Article1: The difference between let and const in Javascript

("Let and const")

In Javascript, let and const are both used to declare variables, but they have some key differences in terms of how they can be assigned and their mutability.

1. let:

• Variables declared with let are mutable, which means their values can be changed after they are assigned.
• let allows you to reassign a new value to the variable later in your code.
• Variables declared with let have block scope, which means they are only accessible within the block they are defined.
• You can declare a variable with let without necessarily assigning it a value right away. Example:

let age = 25;
age = 26; // Value can be changed

2. const:

• Variables declared with const are also block-scoped like let.
• However, const variables are immutable, which means their value cannot be canged after they are assigned.
• You must assign a value to a const variable when it is declared, and you cannot reassign it later. Example:

const pi = 3.14159;
//pi = 3.14; // This would result in an error

3. When to Use Each:

• Use let when you need to reassign the variable's value or its value will change overtime.
• Use const when you want to declare a variable that won't change its value and to enforce immutability for variables that should remain constant.

Choosing between let and const depends on the use case and whether you expect the value of the variable to change. It's a good peactice to use const whenever possible, as it makes your code more predictable and helps prevent unintentional changes to variables that should remain constant. use let when you know the variable's value will change or when you need the flexibility to reassign it.