Crystal Web Dev

Basics

Crystal Constants

Using Constants

Crystal constants use uppercase for immutable compile-time values.

Introduction to Crystal Constants

In Crystal, constants are used to define immutable values that are determined at compile-time. They are a crucial part of the language, providing a way to define fixed values that do not change during the execution of a program.

Syntax for Defining Constants

Constants in Crystal are defined using uppercase letters. By convention, words are separated by underscores for better readability. Here's the basic syntax:

Example of Crystal Constants

Let's look at an example of how to use constants in a Crystal program:

Benefits of Using Constants

Using constants has several advantages:

  • They enhance code readability and maintainability by giving meaningful names to fixed values.
  • Constants help prevent accidental changes to values that should remain unchanged.
  • They can improve performance since their values are determined at compile-time.

Scope of Constants

Constants in Crystal are accessible within the module or class where they are defined. They can also be accessed from outside the module by using the scope resolution operator ::. Here's an example:

Conclusion

Crystal constants are a fundamental feature that helps you define fixed values for your programs efficiently. By understanding how to declare and use constants, you can write more robust and maintainable code.

In the next post, we'll explore operators in Crystal, which will further enhance your programming capabilities in this language.

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