Tutorial by Examples

Interaction with Promises

6 Exceptions are to synchronous code what rejections are to promise-based asynchronous code. If an exception is thrown in a promise handler, its error will be automatically caught and used to reject the promise instead. Promise.resolve(5) .then(result => { throw new Error("I ...

Error objects

Runtime errors in JavaScript are instances of the Error object. The Error object can also be used as-is, or as the base for user-defined exceptions. It's possible to throw any type of value - for example, strings - but you're strongly encouraged to use Error or one of it's derivatives to ensure that...

Compiling with GCC

Assuming a single source file named main.cpp, the command to compile and link an non-optimized executable is as follows (Compiling without optimization is useful for initial development and debugging, although -Og is officially recommended for newer GCC versions). g++ -o app -Wall main.cpp -O0 T...

Get Started in Xamarin Studio

Browse to File > New > Solution to bring you up the new project dialog Select Single View App and press Next Configure your app by setting your app name and organization ID, and press Next: Set your Project name and Solution name, or leave as the default name. Click Create to create...

Float an Image Within Text

The most basic use of a float is having text wrap around an image. The below code will produce two paragraphs and an image, with the second paragraph flowing around the image. Notice that it is always content after the floated element that flows around the floated element. HTML: <p>Lorem ips...
CSS • Floats

Simple Two Fixed-Width Column Layout

A simple two-column layout consists of two fixed-width, floated elements. Note that the sidebar and content area are not the same height in this example. This is one of the tricky parts with multi-column layouts using floats, and requires workarounds to make multiple columns appear to be the same he...
CSS • Floats

Event Bubbling and Capturing

Events fired on DOM elements don't just affect the element they're targeting. Any of the target's ancestors in the DOM may also have a chance to react to the event. Consider the following document: <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> </hea...
DOM • Events

List Literals

GHC's OverloadedLists extension allows you to construct list-like data structures with the list literal syntax. This allows you to Data.Map like this: > :set -XOverloadedLists > import qualified Data.Map as M > M.lookup "foo" [("foo", 1), ("bar", 2)] Just ...

Checking arithmetic with assert

a = 1 - Math.abs(1 - a % 2); // This will throw an error if my arithmetic above is wrong. assert a >= 0 && a <= 1 : "Calculated value of " + a + " is outside of expected bounds"; return a;

Downloading a file via curl

This downloads a file from the Dropbox API at the remote path /Homework/math/Prime_Numbers.txt to the local path Prime_Numbers.txt in the current folder: curl -X POST https://content.dropboxapi.com/2/files/download \ --header "Authorization: Bearer <ACCESS_TOKEN>" \ --head...

Downloading a file with progress information using the SwiftyDropbox library

Adapted from the tutorial, this uses the SwiftyDropbox library to download a file, with a progress callback on the download method to get progress information: // Download a file let destination : (NSURL, NSHTTPURLResponse) -> NSURL = { temporaryURL, response in let fileManager = NSFileMan...

Downloading a file using the Dropbox Python library

This uses the Dropbox Python SDK to download a file from the Dropbox API at the remote path /Homework/math/Prime_Numbers.txt to the local file Prime_Numbers.txt: import dropbox dbx = dropbox.Dropbox("<ACCESS_TOKEN>") with open("Prime_Numbers.txt", "wb") as f:...

Downloading a file with every error case handled using the SwiftyDropbox library

Dropbox.authorizedClient!.files.download(path: path, destination: destination).response { response, error in if let (metadata, url) = response { print("*** Download file ***") print("Downloaded file name: \(metadata.name)") print("Downloaded f...

Downloading a file via curl in C++

#include <stdio.h> #include <curl/curl.h> int main (int argc, char *argv[]) { CURL *curl; CURLcode res; /* In windows, this will init the winsock stuff */ curl_global_init(CURL_GLOBAL_ALL); /* get a curl handle */ curl = curl_easy_init()...

Downloading a piece of a file via curl using Range Retrieval Requests

This downloads just a piece of a file, using Range Retrieval Requests, from the Dropbox API at the remote path /Homework/math/Prime_Numbers.txt to the local path Prime_Numbers.txt.partial in the current folder: curl -X GET https://content.dropboxapi.com/2/files/download \ --header "Auth...

Uploading a file via curl in PHP

<?php $path = 'test_php_upload.txt'; $fp = fopen($path, 'rb'); $size = filesize($path); $cheaders = array('Authorization: Bearer <ACCESS_TOKEN>', 'Content-Type: application/octet-stream', 'Dropbox-API-Arg: {"path":"/test/'.$path.'...

Uploading a file via curl in C++

#include <stdio.h> #include <curl/curl.h> int main (int argc, char *argv[]) { CURL *curl; CURLcode res; /* In windows, this will init the winsock stuff */ curl_global_init(CURL_GLOBAL_ALL); /* get a curl handle */ curl = curl_easy_init()...

Uploading a file via curl

This uploads a file from the local path matrices.txt in the current folder to /Homework/math/Matrices.txt in the Dropbox account, and returns the metadata for the uploaded file: echo "some content here" > matrices.txt curl -X POST https://content.dropboxapi.com/2/files/upload \ ...

Uploading a file from NSData with every error case handled using the SwiftyDropbox library

This uses the SwiftyDropbox library to upload a file from a NSData to the Dropbox account, using upload sessions for larger files, handling every error case: import UIKit import SwiftyDropbox class ViewController: UIViewController { // replace this made up data with the real data le...

Uploading a file using the Dropbox .NET library

This example uses the Dropbox .NET library to upload a file to a Dropbox account, using upload sessions for larger files: private async Task Upload(string localPath, string remotePath) { const int ChunkSize = 4096 * 1024; using (var fileStream = File.Open(localPath, FileMode.Open)) ...

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