Jeremiah Ogbomo jogboms

Async/Await for Swift

Proposal: SE-XXXX
Authors: Chris Lattner, Joe Groff

Introduction

Modern Cocoa development involves a lot of asynchronous programming using closures and completion handlers, but these APIs are hard to use. This gets particularly problematic when many asynchronous operations are used, error handling is required, or control flow between asynchronous calls gets complicated. This proposal describes a language extension to make this a lot more natural and less error prone.

This paper introduces a first class Coroutine model to Swift. Functions can opt into to being async, allowing the programmer to compose complex logic involving asynchronous operations, leaving the compiler in charge of producing the necessary closures and state machines to implement that logic.

Android: Generate Release/Debug Keystores

Generate Keystores

Debug Keystore

$ keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000 -dname "C=US, O=Android, CN=Android Debug"

	/*
	* Convert A String to Base64 String or Vice-Versa
	*/

	declare const android: any;
	declare const java: any;
	declare const NSData: any;
	declare const NSUTF8StringEncoding: any;
	declare const NSString: any;

	const waitFor = (ms) => new Promise(r => setTimeout(r, ms))
	const asyncForEach = async (array, callback) => {
	for (let index = 0; index < array.length; index++) {
	await callback(array[index], index, array)
	}
	}

	const start = async () => {
	await asyncForEach([1, 2, 3], async (num) => {
	await waitFor(50)

	<?xml version="1.0" encoding="utf-8"?>
	<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="__PACKAGE__"
	android:versionCode="1"
	android:versionName="1.0">

	<supports-screens
	android:smallScreens="true"
	android:normalScreens="true"
	android:largeScreens="true"

	import { Pipe, PipeTransform, NgZone } from '@angular/core';
	import { Observable } from 'rxjs/Observable';

	import { ImageSource, fromResource } from 'image-source';
	import { Cache } from 'ui/image-cache';

	import { isFileOrResourcePath, isDataURI } from 'utils/utils';

	let cache = new Cache();
	cache.placeholder = fromResource('placeholder');

	// In case of Angular, this is the component that contains a view with a <RadSideDrawer>

	export class MenuComponent implements AfterViewInit {

	@ViewChild(RadSideDrawerComponent) public drawerComponent: RadSideDrawerComponent;
	private _drawer: SideDrawerType;

	ngAfterViewInit(): void {
	this._drawer = this.drawerComponent.sideDrawer;
	this._changeDetectionRef.detectChanges();

	// Ran with http://www.cryptosys.net/pki/uuid-rfc4122.html

	import 'dart:math' as m;

	void main() {
	for (var i = 0; i < 1000000; i++) {
	var thing = getThing();

	print(thing);
	print(thing.length);

	// Usage: <Label maxLines="3" .. />

	import { Directive, ElementRef, Input, OnInit, OnChanges } from '@angular/core';
	import { Label } from 'tns-core-modules/ui/label';

	declare const android, NSLineBreakMode: any;

	@Directive({
	selector: 'Label[maxLines]',
	})

	import { Directive, ElementRef, Input, OnInit, OnChanges } from '@angular/core';
	import { Label } from 'ui/label';

	@Directive({
	selector: '[maxLines]',
	})
	export class LabelMaxLinesDirective implements OnInit, OnChanges {
	@Input('maxLines') public maxLines: number = 1;

	public get nativeView(): Label {