var, let and const keywords in JavaScript - Difference between them
Learn the difference between var, let, and const keywords in JavaScript. Understand their scope, hoisting, and best practices for declaring variables in modern web development.
Sign in to track your courses, save progress, and apply for internships. Sign in or create an account.
2 Answers
- *`let`:*
- Allows you to reassign values.
- Can be declared without an initial value.
- Good for variables that might change.
- *`const`:*
- Does not allow reassignment after the initial value is set.
- Must be assigned a value when declared.
- Ideal for variables that should remain constant.
In simple terms:
- let:
- You can change the value after declaring it.
- You can declare it without giving it a value initially.
- const:
- Once you give it a value, you can't change it.
- You must give it a value when you declare it.
So, use `let` if you might change the value later, and use `const` if you don't plan on changing it.
