This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.
To capture the video (filesize: 19MB), using the free "QuickTime Player" application:
mr Marathi | |
bs Bosnian | |
ee_TG Ewe (Togo) | |
ms Malay | |
kam_KE Kamba (Kenya) | |
mt Maltese | |
ha Hausa | |
es_HN Spanish (Honduras) | |
ml_IN Malayalam (India) | |
ro_MD Romanian (Moldova) |
[user] | |
name = Pavan Kumar Sunkara | |
email = pavan.sss1991@gmail.com | |
username = pksunkara | |
[init] | |
defaultBranch = master | |
[core] | |
editor = nvim | |
whitespace = fix,-indent-with-non-tab,trailing-space,cr-at-eol | |
pager = delta |
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs
// | |
// Obfuscator.swift | |
// | |
// Created by Dejan Atanasov on 2017-05-31. | |
// | |
import Foundation | |
class Obfuscator: AnyObject { | |
The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).
My take-aways are:
You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse
### Global configuration | |
# Enable rules which are not in the default set | |
opt_in_rules: | |
# - anyobject_protocol # Prefer using `AnyObject` over `class` for class-only protocols. | |
# - array_init # Prefer using `Array(seq)` over `seq.map { $0 }` to convert a sequence into an Array. | |
# - attributes # Attributes should be on their own lines in functions and types, but on the same line as variables and imports. | |
- block_based_kvo # Prefer the new block based KVO API with keypaths when using Swift 3.2 or later. | |
- class_delegate_protocol # Delegate protocols should be class-only so they can be weakly referenced. | |
- closing_brace # Closing brace with closing parenthesis should not have any whitespaces in the middle. |
First you'll want to check if you need a visa to enter the UK.
The rules for allowable business travel under a visa exemption are covered by the same rules as those travelling under a vistor visa. If you will be travelling under a visa-exemption and the conference is covering your costs in any way you should make sure to read the relevant section below.
import UIKit | |
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { | |
@IBOutlet weak var tableView: UITableView! | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
NSLayoutConstraint.activate([ | |
tableView.topAnchor.constraint(equalTo: view.topAnchor), |