Tutorial by Examples: i

use std::fs::File; use std::io::Read; fn read_a_file() -> std::io::Result<Vec<u8>> { let mut file = try!(File::open("example.data")); let mut data = Vec::new(); try!(file.read_to_end(&mut data)); return Ok(data); } std::io::Result<T>...

The map operation is a useful tool when working with arrays and vectors, but it can also be used to deal with Option values in a functional way. fn main() { // We start with an Option value (Option<i32> in this case). let some_number = Some(9); // Let's do some consecutive ...

1) Form Request Validation You may create a "form request" which can hold the authorization logic, validation rules, and error messages for a particular request in your application. The make:request Artisan CLI command generates the class and places it in the app/Http/Requests director...

public class MainApplication extends Application { private static Context context; //application context private Handler mainThreadHandler; private Toast toast; public Handler getMainThreadHandler() { if (mainThreadHandler == null) { mainThreadHand...

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Exceptions in Laravel are handled by App\Exceptions\Handler.php This file contains two functions by default. Report & Render. We will only be using the first public function report(Exception $e) The report method is used to log exceptions or send them to an external service like BugSnag...

Manual Global Installation For OS X and Linux: Bring up Terminal, Bash, or your normal shell. Type the following into Terminal/Bash: # Download latest stable release using the code below or browse to github.com/drush-ops/drush/releases. php -r "readfile('http://files.drush.org/drus...

Manual installation Type below commands in Terminal. php -r "readfile('http://files.drush.org/drush.phar');" > drush chmod +x drush sudo mv drush /usr/local/bin drush init # Add alias in bash startup file. Composer Assuming composer is installed. composer global require drush/...

Onsen UI is an open-source framework that helps you build hybrid apps with native like performance. It can be used along with several well known JavaScript frameworks such as AngularJS (1 & 2), ReactJS and jQuery. Loading OnsenUI in a project is as easy as writing some standard tags of HTML in ...

One common use for the FOR XML function is to concatenate the values of multiple rows. Here's an example using the Customers table: SELECT STUFF( (SELECT ';' + Email FROM Customers where (Email is not null and Email <> '') ORDER BY Email ASC FOR XM...

Install npm install tsify Using Command Line Interface browserify main.ts -p [ tsify --noImplicitAny ] > bundle.js Using API var browserify = require("browserify"); var tsify = require("tsify"); browserify() .add("main.ts") .plugin("tsify&quot...

Update project file to include locally installed Microsoft.TypeScript.Default.props (at the top) and Microsoft.TypeScript.targets (at the bottom) files: <?xml version="1.0" encoding="utf-8"?> <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns=...

Sometimes we have to resize a UILabel based on dynamic content where the text length is unknown. In this example, width of the UILabel is fixed at 280 points and the height is infinite, lets say 9999. Estimating the frame with respect to the text style and maximumLabelSize. Objective-C UILabel * l...

To create a CSS triangle define an element with a width and height of 0 pixels. The triangle shape will be formed using border properties. For an element with 0 height and width the 4 borders (top, right, bottom, left) each form a triangle. Here's an element with 0 height/width and 4 different color...

Circle To create a circle, define an element with an equal width and height (a square) and then set the border-radius property of this element to 50%. HTML <div class="circle"></div> CSS .circle { width: 50px; height: 50px; background: rgb(246, 156, 85); ...

DROP PROCEDURE if exists displayNext100WithName; DELIMITER $$ CREATE PROCEDURE displayNext100WithName ( nStart int, tblName varchar(100) ) BEGIN DECLARE thesql varchar(500); -- holds the constructed sql string to execute -- expands the sizing of the output buffer to accomoda...

A closure can be defined with a typealias. This provides a convenient type placeholder if the same closure signature is used in multiple places. For example, common network request callbacks or user interface event handlers make great candidates for being "named" with a type alias. public...

;; disable automatic loading of packages after the init file (setq package-enable-at-startup nil) ;; instead load them explicitly (package-initialize) ;; refresh package descriptions (unless package-archive-contents (package-refresh-contents)) ;;; use-package initialization ;;; install ...

With the border-image property you have the possibility to set an image to be used instead of normal border styles. A border-image essentially consist of a border-image-source: The path to the image to be used border-image-slice: Specifies the offset that is used to divide the image into nine r...

cat >file It will let you write the text on terminal which will be saved in a file named file. cat >>file will do the same, except it will append the text to the end of the file. N.B: Ctrl+D to end writing text on terminal (Linux) A here document can be used to inline the content...