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LINQ GroupByDate Reporting Extension

This IQueryable<T> extension saves a bit of time when writing a report that groups results by date. You can specify which timeframes to group by (day, week, month, year), or use the default automatic thresholds.

This method also accepts and corrects null dates based on the available results. It does this by performing a simple query to grab the starting date, if it's missing, before running the main report query.

Sample Usage

public class OrderCountRow: ReportingExtensions.ReportRow

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import Foundation
import PlaygroundSupport

//class that allows fully-swift weak reference storage for arrays/dictionaries
class Weak<T> {
    private weak var _object: AnyObject?
    var object: T? { return _object as? T }
    
    init(object: T) {
        _object = object as AnyObject

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//: Playground - noun: a place where people can play

extension Array where Element: Comparable {
    /**
     Compares array with passed array and returns the differences. Warning: Must be a set of data (no duplicate values)
     - Parameter with: The new array to compare to the existing array
     - Returns: A tuple with an array of added items and an array of removed items.
     */
    func diff(with array: Array) -> (added: Array, removed: Array) {
        let originalArray = self.sorted()

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import Foundation
import PlaygroundSupport

//class that allows fully-swift weak reference storage for arrays/dictionaries
class Weak<T> {
    private weak var _object: AnyObject?
    var object: T? { return _object as? T }
    
    init(object: T) {
        _object = object as AnyObject

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//
//  StackCollectionView.swift
//
//  Created by Albert Bori on 6/23/17.
//

import UIKit

@IBDesignable
class StackCollectionView: UIView {

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//
//  HideableUIView.swift
//  Albert Bori
//
//  Created by Albert Bori on 5/19/15.
//  Copyright (c) 2015 Albert Bori under the MIT license.
//  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//  
//  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//  

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//
//  StandardTooltip.swift
//
//  Created by Albert Bori on 11/20/17.
//

import Foundation

@objc
class StandardTooltip: NSObject {

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import UIKit
import Foundation

@IBDesignable class PlaceholderTextView: UITextView, UITextViewDelegate
{
    private let _placeholderColor: UIColor = UIColor(white: 0.78, alpha: 1)
    private var _placeholderLabel: UILabel!
    
    @IBInspectable var placeholder: String = "" {
        didSet {

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import UIKit
import MBProgressHUD

class ImageViewController: UIViewController, UIScrollViewDelegate {
    
    @IBOutlet weak var scrollView: UIScrollView!
    
    var imageURL: String?
    private var imageView: UIImageView!
    

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/*
This example shows how a simple property wrapper can be declared and initialized.
*/

@propertyWrapper
struct ExampleA<Value> {
    private var value: Value
    
    var wrappedValue: Value {
        get { value }