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• async/await and Structured Concurrency introduce the syntactical building blocks (including the Task type) for writing asynchronous code using Swift-native language features.
• There is a WIP standalone proposal to add async let syntax to greatly reduce a pain point of filling values asynchronously for later use.
• actor types introduce a new top-level reference type (like class) that require and statically enforce that access to any of their mutable state be done asynchronously (such as by using the async/await syntax), and exist to help model thread-safe mutable data structures. The idea of [global actors](https://github

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“_wrappers.so” cannot be opened because the developer cannot be verified.

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https://gist.github.com/70547c03a0df58b349eed8d600fced9b

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import Foundation

@propertyWrapper public struct Percentage<Value: FloatingPoint> {
    
    private var storage: Value
    private let upperBound: Value
    
    public init(wrappedValue: Value, upperBound: Value = (1.0 as! Value)) {
        self.storage = wrappedValue
        self.upperBound = upperBound

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/// Pseudorandomly choose a value from an array of values, where each is weighted relative to the others in the collection.
///
/// The `weight` component of each tuple is a positive integer signalling how likely a value is to be chosen vs. other values with different weights. For example, a value with a weight of `4` is four times as likely as a value with a weight of `1` to be chosen.
///
/// - Parameter values: an array of `(value:Thing,weight:Int)` tuples.
///
/// - Returns: a single chosen value.
///
func pickWeighted<Thing>(from weightedValues: [(value: Thing, weight: Int)]) -> Thing {
    // compute the sum of the weights of all of the value/weight pairs

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Image augmentation option 'exposure' selected.
Image augmentation option 'shear' selected.
Automatically generating validation set from 10% of the data.
Extracting augmented image features from training data set.
Analyzing and extracting image features.
+----------------------+------------------+--------------+------------------+
| Raw Images Processed | Augmented Images | Elapsed Time | Percent Complete |
+----------------------+------------------+--------------+------------------+
| 1                    | 16               | 2.31s        | 2%               |
| 2                    | 32               | 2.98s        | 4%               |

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struct Zip3Iterator
<
    A: IteratorProtocol,
    B: IteratorProtocol,
    C: IteratorProtocol
>: IteratorProtocol {
    
    private var first: A
    private var second: B

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//
//  ViewController.swift
//  DragTable
//
//  Created by Anna Kim on 2017. 2. 9..
//  Copyright © 2017년 Anna Kim. All rights reserved.
//

import Cocoa

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//
//  UserDefault.swift
//
//  Created by Michael L. Ward on 5/29/17.
//  Copyright © Michael L. Ward. All rights reserved.
//

import Foundation

struct UserDefault<T> {

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//
//  Copyright © 2015 Big Nerd Ranch
//

import UIKit

class ImageStore {
    
    let cache = NSCache<NSString, UIImage>()