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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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// Result is a superpowered enum that can be Success or Failure
// and the basis for a railway junction
sealed class Result<T>
data class Success<T>(val value: T): Result<T>()
data class Failure<T>(val errorMessage: String): Result<T>()

// Composition: apply a function f to Success results
infix fun <T,U> Result<T>.then(f: (T) -> Result<U>) = 
    when (this) {
        is Success -> f(this.value)

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Background

Platform-Agnostic

• "Introduction to Bluetooth Low Energy" by Adafruit.

Android-Specific

• "Android Lollipop: Bluetooth LE Matures" - A nice overview video by Dave Smith. Focuses on Lollipop and newer.
• Fragmented Episode 45: "Bluetooth (LE) with Dave (devunwired) Smith" - Another great Dave Smith overview if you prefer the podcast format!