| func timeAgoSinceDate(date:NSDate, numericDates:Bool) -> String { | |
| let calendar = NSCalendar.currentCalendar() | |
| let now = NSDate() | |
| let earliest = now.earlierDate(date) | |
| let latest = (earliest == now) ? date : now | |
| let components:NSDateComponents = calendar.components([NSCalendarUnit.Minute , NSCalendarUnit.Hour , NSCalendarUnit.Day , NSCalendarUnit.WeekOfYear , NSCalendarUnit.Month , NSCalendarUnit.Year , NSCalendarUnit.Second], fromDate: earliest, toDate: latest, options: NSCalendarOptions()) | |
| if (components.year >= 2) { | |
| return "\(components.year) years ago" | |
| } else if (components.year >= 1){ |
| //Safe bounds check for Array | |
| //http://stackoverflow.com/questions/25329186/safe-bounds-checked-array-lookup-in-swift-through-optional-bindings | |
| extension Collection { | |
| /// Returns the element at the specified index iff it is within bounds, otherwise nil. | |
| subscript (safe index: Index) -> Iterator.Element? { | |
| return index >= startIndex && index < endIndex ? self[index] : nil | |
| } | |
| } | |
| //Helper function to exchange position in one array |
| let url = NSURL(string: "https://www.google.net") | |
| let request = NSURLRequest(URL: url!) | |
| let group = dispatch_group_create() | |
| for index in 1...100 { | |
| dispatch_group_enter(group) | |
| NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {(response, data, error) in | |
| println("\(index) complete") | |
| dispatch_group_leave(group) | |
| } |
| //If you have a Bridging-Header: | |
| #import <FBSDKCoreKit/FBSDKCoreKit.h> | |
| #import <FBSDKLoginKit/FBSDKLoginKit.h> | |
| //In your AppDelegate: | |
| func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [String: AnyObject]?) -> Bool { | |
| //App launch code | |
| FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions) | |
| //Optionally add to ensure your credentials are valid: |
| func sumRecursively(numbers: [Int], _ acc:Int = 0) -> Int { | |
| if let head = numbers.first { | |
| let tail = Array(dropFirst(numbers)) | |
| return sumRecursively(tail, head + acc) | |
| } else { | |
| return acc | |
| } | |
| } | |
| let myNumbers = [1,2,3,4,5] |
| // See http://techlife.cookpad.com/entry/2014/11/12/170041 | |
| // | |
| // 本来はplayground用に用意されているXCPlaygroundフレームワークのXCPShowViewを使って | |
| // Timelineに表示することが可能ですが、現行のXcode6.1でiOS用にUIKitを使って表示した場合 | |
| // コンソールにエラーが出てしまうため使用していません。 | |
| // | |
| import UIKit | |
| // ビューのサイズ |
| func debounce( delay:NSTimeInterval, #queue:dispatch_queue_t, action: (()->()) ) -> ()->() { | |
| var lastFireTime:dispatch_time_t = 0 | |
| let dispatchDelay = Int64(delay * Double(NSEC_PER_SEC)) | |
| return { | |
| lastFireTime = dispatch_time(DISPATCH_TIME_NOW,0) | |
| dispatch_after( | |
| dispatch_time( | |
| DISPATCH_TIME_NOW, |
It's a common pattern in React to wrap a component in an abstraction. The outer component exposes a simple property to do something that might have more complex implementation details.
We used to have a helper function called transferPropsTo. We no longer support this method. Instead you're expected to use a generic object helper to merge props.
render() {
return Component(Object.assign({}, this.props, { more: 'values' }));
(by @andrestaltz)
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.
