169: Testing and JUnit 5 with Marcel Schnelle


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Marcel Schnelle joins Donn in this episode to talk about how to get your application under test and some steps to go from scared to confident in your testing process. The second half of the show they dive in deep to JUnit 5 and its new features.

JUnit 5 is backwards compatible with JUnit 4 and offers a slew of new features and extensibility points which make the framework much more appealing going forward. We’re convinced you’ll enjoy this episode and leave wanting to get your app under test – even more than it already is.

Enjoy.

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168: Learning Kotlin: Lambda Expressions Part 2

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In this episode, Donn continues his talks about Kotlin Lambda Expressions. He explains how you can use lambda expressions as function parameters and as return types for functions.

This is a very dense episode – if you get lost look at the code snippets below or view on them on fragmentedpodcast.com


class LogReader {
    fun processFile(file: File, processLine: (String) -> Unit = {}) {
        file.forEachLine {
            println("Number of Chars: ${it.length}")
            processLine(it)
            println("Line Done Processing")
        }
    }

    fun processFileWithHandlers(file: File, logHandler: LogHandler) {
        file.forEachLine {
            println("Start of Processing")
            logHandler.handleLine().forEach { handler -> handler(it) }
            println("Line Done Processing")
        }
    }
}

interface LogHandler {
    fun handleLine(): List<(String) -> Unit>
}


val reader = LogReader()
val textFile = File("/Users/donnfelker/scratch/lorem.txt")

// Process with single lambda
reader.processFile(textFile, { println("First 10 Chars: ${it.substring(0..9)}") })

val logHandler = object : LogHandler {
    override fun handleLine(): List<(String) -> Unit> {
        return listOf<(String) -> Unit>(
            { line -> println("${line.substring(0, 1)}") },
            { line -> println("${line.substring(2, 4)}") },
            { line -> println("${line.substring(5, 10)}") }
        )
    }
}

// Process with multipe handlers via the logHandler
reader.processFileWithHandlers(textFile, logHandler)

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167: Clean Architecture with Joe Birch

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Donn sits down with Buffer Android Lead, Joe Birch. Joe is a GDE for Android, Google Actions, Flutter and Google Pay. In this episode Donn and Joe talk about Clean Architecture, what it is, and why you might want to use it.

They break down the concept of what Clean Architecture is in a manner that is easy for even a beginner to understand.

Enjoy.

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