colomboe

// Porting of https://gist.github.com/jdegoes/dd66656382247dc5b7228fb0f2cb97c8

typealias UserID = String
data class UserProfile(val name: String)

// The database module:
interface DatabaseService {
    suspend fun dbLookup(id: UserID): UserProfile
    suspend fun dbUpdate(id: UserID, profile: UserProfile)
}

elizarov

import kotlinx.coroutines.*
import kotlin.coroutines.*

/**
 * Scope interface to control (pause & resume) timeout
 */
interface TimerScope : CoroutineScope {
    fun pause()
    fun resume()
}

androidfred

Kotlin Arrow

A lot of Kotlin features can be traced back to functional programming languages, eg

• Heavy use of immutability-by-default and map, filter etc functions
• Type inference
• Data classes (which enable pattern matching)
• Null safety and dealing with the absence of values

However, Kotlin is missing many incredibly useful data types that are ubiquitous in functional programming languages, eg Either, Try etc.

LordRaydenMK

@Retention(AnnotationRetention.BINARY)
@Target(AnnotationTarget.CLASS)
annotation class ValueClass

chris-hatton

package datasizeformatter

import kotlin.math.abs
import kotlin.math.pow
import kotlin.math.roundToLong

/**
 * Format a human-readable representation of data size, in binary base form.
 * e.g. 1024 -> 1 KiB
 * @param byteCount The number of bytes to represent in human-readable form. `Long.MIN_VALUE` is unsupported.