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Practice

Constants (Constant)

const is short for "constant."

A constant is something that, once assigned a value, cannot have its value changed.

Therefore, a variable declared with const cannot be reassigned after its initial assignment.

Example:

Declaring a constant with const
const birthYear = 1995;

In the example above, we have assigned the value 1995 to the constant named birthYear.

Because birthYear is declared with const, its value cannot be changed once it has been set.


Why use const?​

  1. To store values that should not change: For instance, you can use const for values like the default color theme of a website or a user's date of birth, which should remain constant once set.

  2. Code stability: Using const helps prevent accidental reassignment of variables. Preventing these types of mistakes can reduce bugs in the program.

  3. Code readability: When you or someone else revisits the code later, the use of const makes it clear which values are not supposed to change, making the code easier to understand.

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