Rust TutorialLesson 9Free preview

Rust Constants

This lesson is part of Rust · All levels

Summary

This lesson explains the use of constants on Rust using the keyword 'const'. The constant is always fixed, its value must be a compile-time constant, and its data type must be explicitly declared. Understanding constants helps developers distinguish fixed configuration values from ordinary immutable variables.

Key points

A constant is declared with the keyword 'const', not 'let'
The data type on the constant must be written explicitly
The value of a constant must be compile-time expression
Conventionally, the name of a constant is written using capital letters with a lower-line separator (SCREAMING_SNAKE_CASE)

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