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Behaviour

One of the things we tend to do in OOP is to create types to define behaviours. However, types are best used to describe data, i.e. objects. We've had to use types in the past because of language limitations.

This is a small description of how we can use the power of functions to define code in a way that is easier to read, maintain and test.

Consumer Component

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suspend fun <T, R> T.letOn(
    context: CoroutineContext,
    block: suspend CoroutineScope.(T) -> R
): R = withContext(context) { block(this@letOn) }

suspend fun <T> T.alsoOn(
    context: CoroutineContext,
    block: suspend CoroutineScope.(T) -> Unit
): T = also { withContext(context) { block(this@alsoOn) } }

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import android.content.Context
import android.content.res.Resources
import android.graphics.drawable.Drawable
import android.support.annotation.AnyRes
import android.support.v4.app.Fragment
import android.support.v4.content.res.ResourcesCompat.*
import android.view.View

val Context.animations
    get() = ResourceMapper { resources.getAnimation(it) }

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Gradle Multi project settings Kotlin DSL

This is a small Gradle DSL that can be used to include multiple modules. Let's imagine that we have a set up like this:

root
+-- app
+-- modules
    +-- core
 +-- androidx

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public Object evaluate(float fraction, Object startValue, Object endValue) {
    int startInt = (Integer) startValue;
    float startA = ((startInt >> 24) & 0xff) / 255.0f;
    float startR = ((startInt >> 16) & 0xff) / 255.0f;
    float startG = ((startInt >>  8) & 0xff) / 255.0f;
    float startB = ( startInt        & 0xff) / 255.0f;

    int endInt = (Integer) endValue;
    float endA = ((endInt >> 24) & 0xff) / 255.0f;
    float endR = ((endInt >> 16) & 0xff) / 255.0f;

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import java.io.Serializable
import java.lang.reflect.*
import java.lang.reflect.Array as ArrayType
import java.util.*

val EMPTY_TYPE_ARRAY: kotlin.Array<Type> = emptyArray()

/**
 * Returns a new parameterized type, applying {@code typeArguments} to
 * {@code rawType} and enclosed by {@code ownerType}.

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Left empty

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package com.pusher.chatkit.users

val string by lazy { "" }

val List<String>.describe: String by lazy {
    "this"
}

val List<String>.something: String get() { 
    return "" 

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/**
 * Used to do a trailing throttle of actions.
 */
internal class Throttler<A, B>(
    private val delay: Long = 500,
    private val action: (A) -> B
) {

    private val target = AtomicReference<A>()

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inline fun <A> A.logWith(logger: Logger, block: Logger.(A) -> Unit) : A = 
    this.also { logger.block(it) }

// With interface injection
interface HasLog {
    val log: Logger
    fun <A> A.log(block: Logger.(A) -> Unit) : A =
        logWith(logger, block)
}