A constant is a value that never changes. In Kotlin, you can declare an immutable variable anywhere with the keyword val, but that's just the beginning of the story. Learn how to create real constants, and how to make them globally available to your entire application with having to know where they're defined.
- [Instructor] When you move from Java to Kotlin…you'll find that constants, values that never changed,…are handled differently.…First of all Kotlin has a const key word…which Java lacks, so you can officially label a value…as a constant as opposed to just being another variable.…But they'll also placed in a specific location…within classes, and you can also…create global constants.…Valuables that are available throughout an application.…When I converted this application from Java to Kotlin…I got something called a companion object.…
And a field that I had declared as static…and final in Java, became a member of this companion object.…This is because Kotlin doesn't have a concept…of static class members.…In order to address a value from a class declaration…as opposed from a class instance, you put it inside…a companion object like this.…Now I'm going to add another value here,…and I'll use the same syntax, private val,…and I'll set this constant with a name of THE_ANSWER.…
And I'll give it an integer value of 42.…
Skill Level Intermediate
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