raheelahmad

//
//  PersistenceStack.swift

import CoreData

public class PersistenceStack: NSObject {
    let mainContext: NSManagedObjectContext = {
        let context = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
            context.undoManager = nil
            context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy

Rcureton

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

macsystems

Added in Android Jelly Bean (4.1) - API 16 :

Regular (default):

<item name="android:fontFamily">sans-serif</item>
<item name="android:textStyle">normal</item>

Italic:

<item name="android:fontFamily">sans-serif</item>

Reyurnible

import io.reactivex.Observable
import io.reactivex.subjects.BehaviorSubject

/**
 * Wrapping Rx BehaviorSubject defaultValue object.
 * RxSwfit Variable.swfit https://github.com/jspahrsummers/RxSwift/blob/master/RxSwift/SpinLock.swift
 */
class Variable<T> private constructor(defaultValue: T?) {
    companion object {
        fun <T> create(): Variable<T> = Variable(null)

JimCampagno

Registration Flow - iOS

A crucial type in the app is the CognitoStore. There's only ever one instance of this type that lives throughout the life-cycle of the app. Everywhere in our app, a dev has access to this one instance through the sharedInstance static stored property on the CognitoStore.

Important to note is the init function on this type. It sets everything up, most imporantly the userPool stored property of type AWSCognitoIdentityUserPool. This in turn will provide access to the AWSCognitoIdentityUser that exists on the AWSCognitoIdentityUserPool. This is done by calling currentUser() on the AWSCognitoIdentityUserPool instance.

We expose the AWSCognitoIdentityUser in the form of a computed property named currentUser.

Here's how accessing this currentUser looks like throughout the app:

operando

package rx.playground;

import rx.Observable;
import rx.subjects.BehaviorSubject;
import rx.subjects.SerializedSubject;

public class Variable<T> {
    private T value;

    private final SerializedSubject<T, T> serializedSubject;

ZacSweers

View Click

Instead of the verbose setOnClickListener:

RxView.clicks(submitButton).subscribe(o -> log("submit button clicked!"));

Filter even numbers

Observable
    .just(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

kpgalligan

public class MistakesActivity extends ActionBarActivity
{
    public static final String TABLE_NAME = "names";
    ExecutorService executorService = Executors.newFixedThreadPool(4);

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mistakes);

rakshakhegde

import android.support.v4.app.Fragment
import org.jetbrains.anko.bundleOf

/**
 * Pass arguments to a Fragment without the hassle of
 * creating a static newInstance() method for every Fragment.
 *
 * Declared outside any class to have full access in any
 * part of your package.
 * 

cassiozen

Pixelbook Setup

Change your channel

Some of the features mentioned in this document only work on the beta or Dev channel. To change your channel:

1. chrome://help in a browser window
2. Click Detailed Build Information
3. Change Channel
4. Select Beta (Or Dev, if you're feeling adventurous)