Michael du Plessis optimho

😀

I may be slow to respond.

optimho / lambda.kt

Created January 12, 2022 02:35

Examples Of lambda functions



	fun main(args: Array<String>) {

	// val lambdaName:(InputType, InputType , ..) -> OutputType = {arguementN:InputType, argumentN:InputType -> body}
	// greeter ("Michael", "duplessis")
	// "Hello Michael du Plessis"

optimho / ExtensionFunction.kt

Created January 10, 2022 21:17

You can extent a library function in Kotlin



	fun main(args: Array<String>) {
	val name="michael du Plessis"
	println(name.initials())
	}

	fun String.initials():String{
	val values:List<String> =this.split(' ')
	val firstLetter:String = values[0].substring(0,1)

optimho / TryCatchFinally.kt

Created January 8, 2022 21:28

Make use of the finally satement in the code

	import java.lang.Exception
	import java.time.temporal.TemporalAmount
	import kotlin.reflect.typeOf

	fun main(args: Array<String>) {

	val p:Person = Person("Michael", 18)

	println("Try Check if age throws an exception")
	try {

optimho / try.kt

Last active January 8, 2022 21:11

the try catch block to check and handle potential errors

	import java.lang.Exception
	import java.time.temporal.TemporalAmount
	import kotlin.reflect.typeOf

	fun main(args: Array<String>) {

	val p:Person = Person("Michael", 10)

	println("Try Check if age throws an exception")
	try {

optimho / throwException.kt

Created January 8, 2022 20:55

Create and throw an exception

	import java.time.temporal.TemporalAmount
	import kotlin.reflect.typeOf

	fun main(args: Array<String>) {

	val p:Person = Person("Michael", 10)
	if (p.age<12){
	throw InvalidAgeException(p.age, "WTF dude")

	}

optimho / cast.kt

Created January 8, 2022 20:35

A way of safe casting

	import java.time.temporal.TemporalAmount
	import kotlin.reflect.typeOf

	fun main(args: Array<String>) {

	val obj: Any = getStuff("1")
	val casted: Int? = obj as? Int
	println(casted)

	}

optimho / any.kt

Created January 8, 2022 20:25

returning an any type structure and casting it

	import java.time.temporal.TemporalAmount
	import kotlin.reflect.typeOf

	fun main(args: Array<String>) {

	val obj: Any = getStuff("5")
	val casted: Persons = obj as Persons
	println(casted.name)

	}

optimho / Main.kt

Created January 8, 2022 20:12

type Checking in Kotlin

	import java.time.temporal.TemporalAmount
	import kotlin.reflect.typeOf

	fun main(args: Array<String>) {

	val obj: Any = Persons("Bob")

	if (obj is String) {
	println("It is")
	} else {

optimho / nulls.kt

Created January 8, 2022 09:54

Some more information on using requireNotNull command

	import java.util.concurrent.TimeUnit
	import kotlin.random.Random
	import kotlin.system.measureNanoTime

	fun main(args: Array<String>) {

	var name: String? = "Donn"
	// Tenary operator
	// kotlin doe not have a teneary operator
	// so you can not do this

optimho / checkTheNulls.kt

Created January 8, 2022 09:39

This snippit is an example of how to deal and check for nulls

	import java.util.concurrent.TimeUnit
	import kotlin.random.Random
	import kotlin.system.measureNanoTime

	fun main(args: Array<String>) {

	var name: String? = "Donn"
	// Tenary operator
	// kotlin doe not have a teneary operator
	// so you can not do this