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168: Learning Kotlin: Lambda Expressions Part 2
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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By Donn Felker, Kaushik Gopal
5
6868 ratings
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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Contact
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