Skip to content

Docs: clarify usage of const,let and var in JavaScript variables #869

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
vishwa-radhya wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Docs: clarify usage of const,let and var in JavaScript variables #869

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 10 additions & 0 deletions tutorials/learn-js.org/en/Variables and Types.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,16 @@ We can define several types of variables to use in our code:
const myString = "Hello, World!" // a string
const myBoolean = true; // a boolean

**Note:**

Although older JavaScript code uses `var` to declare variables, modern JavaScript prefers `let` and `const`.

- `var` has function scope and can lead to confusing behavior in some cases.
- `let` is block-scoped and can be reassigned.
- `const` is block-scoped and cannot be reassigned, making it safer for values that should not change.

For this reason, it is recommended to use `const` by default, and `let` only when you need to reassign a variable.

A few notes about variable types in JavaScript:

* In JavaScript, the Number type can be both a floating point number and an integer.
Expand Down