Tutorial by Examples: all

Installation or Setup

Install the SDK Download & unzip the SDK Make sure you are using the latest version of Xcode (7.0+) and targeting iOS 7.0 or highe Download SDK Add the SDKs to your app Drag the Parse.framework and Bolts.framework you downloaded into your Xcode project folder target. Make sure th...

parse.com • Getting started with parse.com

Using *args when calling functions

A common use case for *args in a function definition is to delegate processing to either a wrapped or inherited function. A typical example might be in a class's __init__ method class A(object): def __init__(self, b, c): self.y = b self.z = c class B(A): def __init__(...

Python Language • *args and **kwargs

Using **kwargs when calling functions

You can use a dictionary to assign values to the function's parameters; using parameters name as keys in the dictionary and the value of these arguments bound to each key: def test_func(arg1, arg2, arg3): # Usual function with three arguments print("arg1: %s" % arg1) print("a...

Python Language • *args and **kwargs

Installation or Setup

Detailed instructions on getting facebook set up or installed.

facebook • Getting started with facebook

Bash script to delete all snapshots

#!/bin/bash NO_SNAPSHOTS="No snapshots have been taken yet" SNAPSHOT_OUTPUT=$(vagrant snapshot list | grep "${NO_SNAPSHOTS}") if [ -z "${SNAPSHOT_OUTPUT}" ]; then echo "Found some snapshots, going to remove them" for SNAPSHOT in $(vagrant snap...

vagrant • Snapshots

Find all the numbers in a string

NSString *testString = @"There are 42 sheep and 8672 cows."; NSError *error = nil; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(\\d+)" options:NSRegularExpressionCaseIns...

Objective-C Language • NSRegularExpression

Installation on Linux

Make sure you have ruby installed before installing rubygems, and then: Installing RubyGems Using apt-get on Ubuntu sudo apt-get install rubygems Installing RubyGems Using yum sudo yum install rubygems Manual Installation Method wget https://rubygems.org/rubygems/rubygems-2.6.6.tgz tar xv...

rubygems • Getting started with rubygems

Triggering a task manually

var trigger = new ApplicationTrigger(); TaskHandlerMentionedInThisTutorial.RegisterTask(TaskName, entryPoint, trigger, null, true); await trigger.RequestAsync();

uwp • UWP background tasks

Installation on OS X

Using Homebrew Prerequisites: Make sure you're on OS X 10.9 (Mavericks) or above, and have Homebrew installed. Run the following in your terminal: brew update && brew install rethinkdb Compile from source Building RethinkDB from source requires OS X 10.9 (Mavericks) or greater. Xcode...

rethinkdb • Getting started with rethinkdb

-XXallocClearChunks

This option allows you to clear a TLA for references and values at TLA allocation time and pre-fetch the next chunk. When an integer, a reference, or anything else is declared, it has a default value of 0 or null (depending upon type). At the appropriate time, you will need to clear these references...

Java Language • JVM Flags

-XXallocClearChunkSize

When used with -XXallocClearChunkSize, this option sets the size of the chunks to be cleared. If this flag is used but no value is specified, the default is 512 bytes. Usage: -XXallocClearChunks -XXallocClearChunkSize=<size>[k|K][m|M][g|G]

Java Language • JVM Flags

Unique Index that Allows NULLS

CREATE UNIQUE INDEX idx_license_id ON Person(DrivingLicenseID) WHERE DrivingLicenseID IS NOT NULL GO This schema allows for a 0..1 relationship - people can have zero or one driving licenses and each license can only belong to one person

SQL • Indexes

Installing Electrify for a Meteor application

Electron ports HTML web applications to native applications for a range of devices, including creating native desktop applications. It's also very easy to get started! To begin, we must have electron, nodejs, npm, git and meteor installed. Familiarity with these tools is vital for working with Mete...

meteor • Electrify - Compiling Meteor as a Locally Installable App

Installation or Setup

Installing Angular Material npm npm install angular-material --save bower bower install angular-material --save jspm jspm install angular-material From Cloud cdnjs | jsdelivr | googlecdn Getting Started (blank shell) <html lang="en"> <head> <meta name...

angular-material • Getting started with angular-material

Integer Conversions in Function Calls

Given that the function has a proper prototype, integers are widened for calls to functions according to the rules of integer conversion, C11 6.3.1.3. 6.3.1.3 Signed and unsigned integers When a value with integer type is converted to another integer type other than _Bool, if the value can be r...

C Language • Implicit and Explicit Conversions

Pointer Conversions in Function Calls

Pointer conversions to void* are implicit, but any other pointer conversion must be explicit. While the compiler allows an explicit conversion from any pointer-to-data type to any other pointer-to-data type, accessing an object through a wrongly typed pointer is erroneous and leads to undefined beh...

C Language • Implicit and Explicit Conversions

Synchronously executing asynchronous NPM methods w/ callbacks.

This example wraps the asynchronous method oauth2.client.getToken(callback) from the package NPM package simple-oauth2into a Fiber so that the method may be called synchronously. const oauth2 = require('simple-oauth2')(credentials); const credentials = { clientID: '#####', clientSecret...

meteor • Wrapping asynchronous methods into a Fiber for synchronous execution.

Replacing string match with a callback function

String#replace can have a function as its second argument so you can provide a replacement based on some logic. "Some string Some".replace(/Some/g, (match, startIndex, wholeString) => { if(startIndex == 0){ return 'Start'; } else { return 'End'; } }); // will retur...

JavaScript • Regular expressions

Enable CORS for all requests

Use the UseCors() extension method on the IApplicationBuilder in the Configure method to apply the CORS policy to all requests. public void ConfigureServices(IServiceCollection services) { services.AddMvc(); services.AddCors(); } public void Configure(IApplicationBuilder app) { ...

asp.net-core • Cross-Origin Requests (CORS)

SSIS 2005 Installation

To get SSIS working for a SQL Server 2005 environment Acquire SQL Server 2005 (x86 or 64 bit) images. Mount the second disk and launch the installation wizard "Next" your way through the dialogs until you see see this screen. Under Client Components, ensure Business Intelligence De...

ssis • Getting started with ssis