Request message format, where each search request has a query string, the Defining A Message Typeįirst let’s look at a very simple example. This is a reference guide – for a step by step example that uses many of theįeatures described in this document, see the Protocol buffers language: for information on the proto2 syntax, see the proto file syntax and how to generate dataĪccess classes from your. This guide describes how to use the protocol buffer language to structure your For information specific to the language you’re using, see the corresponding documentation for your language. It is more idiomatic, it makes for cleaner and more readable code but don’t ever forget that it is not a replacement for if-else statements if all we are doing is validating that a given statement is null, and executing another statement in case it is.This topic covers how to use the version 3 of Protocol Buffers in your project.
For a lot of situations a?.let ?: (.) is appropriate. By abusing the use of this construct, in a lot of situations where we could’ve written a simple if-else statement, instead of writing more idiomatic code, we might simply be writing incorrect code. It is not that the a?.let ?: (.) structure is wrong on its own but rather that the mental model we have constructed of it executing only one side of the Elvis operator is incorrect. What happened above is that the lambda result from let was null so a third value was used, neither non-empty nor null, because the way the code was structured allowed for having three branches in the code. This would be similar to having an if-else statement where both the if and else can be executed in a single run, which is definitely not the correct behavior most of us are expecting from an if-else statement.Īs a practical example, let’s consider the following code:Īs we can see, even when string isn’t null we might not necessarily get the value returned by let if that value is actually null. One such example is something I’ve come to see more and more with time: using a?.let as well as the right-side of the Elvis operator. On the other hand, Kotlin is a fairly new language, it has about 10 years, needing some more time to mature, which brings along some dangers because usage of particular constructs can have its perils, without us even realizing. Its use of functional constructs provides developers with power and flexibility that goes way beyond some languages out there - I had been programming in Python and Go previously. Now, Kotlin is a very powerful language and I’ve been enjoying it more and more.
This time I want to write about a pattern I’ve been thinking about: abusing scope functions, in particular let, and using them as if-else for null checks. I’ve been trying to understand more about Kotlin and I’ve written about Kotlin topics more lately, such using require and check functions in Kotlin.
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