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rxwei /
Last active Jan 28, 2020
Upstreaming Swift AutoDiff

Upstreaming Swift AutoDiff

Author: Richard Wei ( on behalf of the Swift for TensorFlow team

Last updated: October 2, 2019


The differentiable programming feature (AutoDiff) has been incubated in the 'tensorflow' branch of apple/swift since December 2017 and released as part of the Swift for TensorFlow toolchains. The Differentiable Programming Mega-Proposal, which serves as a manifesto, received general positive feedback from the community, but there is a long way between receiving conceptual approval and obtaining Swift Evolution approval of such a large feature. We would like to merge the pieces into the 'master' branch under a gate to further development and bake the feature on master, just like Apple develops its major features

Gankra /
Last active Apr 3, 2019
Swift Ownership Manifesto TL;DR

Swift Ownership Manifesto TL;DR

Most of the manifesto is background and detailed definitions -- if you're confused or want details, read the manifesto!

Note also that manifestos aren't complete proposals -- syntax and details may change!

One piece of background: inout is kinda complicated because it can be used on computed properties -- foo(&val.x) might be sugar for


Value Subtypes and Generalized Enums, a manifesto

The goal of this document is to provide a comprehensive view of what value subtyping might look like in Swift and demonstrate how generalized enums play a significant role in this future.

Note: All syntax used in this document that is not currently valid Swift syntax is only intended to serve the purpose of demonstrating ideas and to serve as a point of reference for future proposals. The intent is not to propose that this exact syntax be used.

Acknowledgement: some of the ideas in this document have been inspired by Niko Matsakis' blog post exploring similar ideas in the context of Rust:


tomduckering / ValueTransformer.swift
Last active Oct 25, 2018 — forked from gonzalezreal/ValueTransformer.swift
Type safe NSValueTransformer
View ValueTransformer.swift
import Foundation
private class BasicValueTransformer: ValueTransformer {
let transform: (AnyObject?) -> (AnyObject?)
init(transform: @escaping (AnyObject?) -> (AnyObject?)) {
self.transform = transform
// MARK: NSValueTransformer
santisbon /
Last active Mar 29, 2020
Bring your feature branch up to date with master. Deploying from Git branches adds flexibility. Bring your branch up to date with master and deploy it to make sure everything works. If everything looks good the branch can be merged. Otherwise, you can deploy your master branch to return production to its stable state.

Updating a feature branch

First we'll update your local master branch. Go to your local project and check out the branch you want to merge into (your local master branch)

$ git checkout master

Fetch the remote, bringing the branches and their commits from the remote repository. You can use the -p, --prune option to delete any remote-tracking references that no longer exist in the remote. Commits to master will be stored in a local branch, remotes/origin/master

View with.swift
// @discardableResult to be added
// @noescape needs to move to type annotation
// needs to add _ for item
public func with<T>(item: T, @noescape update: (inout T) throws -> Void) rethrows -> T {
var this = item; try update(&this); return this
mattshepherd / apple help book example.txt
Last active Jan 12, 2020
To support the table of contents button in the OS X Help Book app you need to implement the following code. This isn't documented anywhere but I found it in Apple's own help files and tested it to work. I believe it only works in the more recent versions of OS X, so you if your app supports really old versions you might want to check it.
View apple help book example.txt
//disable TOC button
//enable TOC button
//If you call this on window load it will flash active for a brief second and then disable again.
//Call if after a delay of 250ms and is works fine
//Not sure what the second variable does yet, but passing false works fine
window.HelpViewer.showTOCButton( true, false, function() {
//do something to toggle TOC in your webpage
View example1.swift
import UIKit
import XCPlayground
class ViewController: UIViewController {
func action() { print("Bing!") }
override func viewDidLoad() {
view.backgroundColor = .whiteColor()
IanKeen / Example.swift
Last active Jul 10, 2019
Small utility methods to simplify dealing with Reusable items i.e. table/collection view cells
View Example.swift
//`UITableViewCell` and `UICollectionViewCell` are `Reusable` by defaut
//Use the extension method to dequeue an instance of the appropriate `Reusable`
class MyVC: UITableViewDataSource {
override func viewDidLoad() {
mikezs / BoyerMoore.swift
Created Nov 24, 2015
Proper Boyer-Moore string searching in Swift 2.0
View BoyerMoore.swift
* Implemention from here:
extension String {
private func preBmBc(forString x: String) -> [Character: Int] {
let m = x.characters.count
var bmBc = [Character: Int](/*count: alphabetSize, repeatedValue: m*/)
for i in 0...m - 2 {
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