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View markov_chain.ex
defmodule MarkovChain do
def create_chain(source, ngram_length) do
|> Stream.chunk_every(ngram_length + 1, 1)
|> chunk -> Enum.split(chunk, ngram_length) end)
|> Stream.scan(%{}, fn {ngram, word}, acc ->
Map.update(acc, ngram, word, fn val -> val ++ word end)

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jarsen / JaSONObject.swift
Last active Nov 10, 2017
JaSON Playground
View JaSONObject.swift
import Foundation
// MARK: - JSONError Type
public enum JSONError: ErrorType, CustomStringConvertible {
case KeyNotFound(key: String)
case NullValue(key: String)
case TypeMismatch(expected: Any, actual: Any)
View StoryboardInstantiable.swift
protocol StoryboardInstantiable {
static var storyboardName: String { get }
static var storyboardIdentifier: String { get }
extension StoryboardInstantiable {
static func instantiateFromStoryboard() -> Self {
let storyboard = UIStoryboard(name: storyboardName, bundle: nil)
guard let vc = storyboard.instantiateViewControllerWithIdentifier(storyboardIdentifier) as? Self else {
fatalError("Instantiated view controller does not match type")
View where.swift
import UIKit
enum MyError: ErrorType {
case Oooggh(String)
func errorProne() throws {
throw MyError.Oooggh("nope")
jarsen / JaSON.swift
Last active Nov 10, 2016
JSON Value Extraction in Swift. Blog post here
View JaSON.swift
import Foundation
// MARK: - JSONError Type
public enum JSONError: ErrorType, CustomStringConvertible {
case KeyNotFound(key: JSONKeyType)
case NullValue(key: JSONKeyType)
case TypeMismatch(expected: Any, actual: Any)
View magiclessJarSONv3.swift
// MARK: - Keys
import Foundation
public protocol JSONKeyType {
var JSONKey: String { get }
extension String: JSONKeyType {
public var JSONKey: String {
View KeyboardNotifications.swift
func keyboardWillShow(notification: NSNotification) {
print("Showing keyboard")
guard let userInfo = notification.userInfo,
rectValue = userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue,
rawCurve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? UInt,
duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Double else {
let keyboardFrame = rectValue.CGRectValue()
jarsen / attemptMap.swift
Created Jul 13, 2015
attemptMap for Reactive Cocoa that deals with `throws`
View attemptMap.swift
func attemptMap<T, U>(operation: T throws -> U) -> ReactiveCocoa.Signal<T, NSError> -> ReactiveCocoa.Signal<U, NSError> {
return { signal in
return Signal { observer in
signal.observe(next: { value in
do {
sendNext(observer, try operation(value))
catch {
sendError(observer, error as NSError)
jarsen / Debuggable.swift
Last active Aug 3, 2017
conform to this protocol and get a debugPrint for free
View Debuggable.swift
protocol Debuggable {
var debug: Bool { get set }
func debugPrint(message: String)
extension Debuggable {
func debugPrint(message: String) {
if debug {
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