Tutorial by Examples: io

Phoenix framework is written in Elixir, and Elixir itself is based on Erlang language and leverages the Erlang VM, known for running low-latency, distributed and fault-tolerant systems. Both languages are required for using phoenix framework. Following following step to install phoenix framework: 1...

ActionMailer supports three callbacks before_action after_action around_action Provide these in your Mailer class class UserMailer < ApplicationMailer after_action :set_delivery_options, :prevent_delivery_to_guests, :set_business_headers Then create these methods under the private ...

Get All Annotation //following method returns all annotations object added on map NSArray *allAnnotations = mapView.annotations; Get Annotation View for (id<MKAnnotation> annotation in mapView.annotations) { MKAnnotationView* annotationView = [mapView viewForAnnotation:annotation];...

Stream operations fall into two main categories, intermediate and terminal operations, and two sub-categories, stateless and stateful. Intermediate Operations: An intermediate operation is always lazy, such as a simple Stream.map. It is not invoked until the stream is actually consumed. This can...

Get all documents in the collection 'myCollection' and print them to the console. const MongoClient = require('mongodb').MongoClient; const url = 'mongodb://localhost:27017/test'; MongoClient.connect(url, function (err, db) { if (err) throw new Error(err); var cursor = db.collection('my...

You can use the plus (+) operator to concatenate strings: 'Dart ' + 'is ' + 'fun!'; // 'Dart is fun!' You can also use adjacent string literals for concatenation: 'Dart ' 'is ' 'fun!'; // 'Dart is fun!' You can use ${} to interpolate the value of Dart expressions within strings. The curly...

# The following shell function will be used to generate completions for # the "nuance_tune" command. _nuance_tune_opts () { local curr_arg prev_arg curr_arg=${COMP_WORDS[COMP_CWORD]} prev_arg=${COMP_WORDS[COMP_CWORD-1]} # The "config" option takes a file arg, so ...

C extensions are comprised of two general pieces: The C Code itself. The extension configuration file. To get started with your first extension put the following in a file named extconf.rb: require 'mkmf' create_makefile('hello_c') A couple of things to point out: First, the name hell...

Reduction is the process of applying a binary operator to every element of a stream to result in one value. The sum() method of an IntStream is an example of a reduction; it applies addition to every term of the Stream, resulting in one final value: This is equivalent to (((1+2)+3)+4) The reduc...

Sun / Oracle releases of Java SE come in two forms: JRE and JDK. In simple terms, JREs support running Java applications, and JDKs also support Java development. Java Runtime Environment Java Runtime Environment or JRE distributions consist of the set of libraries and tools needed to run and mana...

Idiom specific adjustments can be done from C# code, for example for changing the layout orientation whether the view is shown or a phone or a tablet. if (Device.Idiom == TargetIdiom.Phone) { this.panel.Orientation = StackOrientation.Vertical; } else { this.panel.Orientation = Stac...

To mark some expression as an abbreviation, use <abbr> tag: <p>I like to write <abbr title="Hypertext Markup Language">HTML</abbr>!</p> If present, the title attribute is used to present the full description of such abbreviation.

Source table RowABCD1CodeProductColourPrice21penred50032penblue-5043penred054pencilblue1765pencilgreen-1.5 to select all: = QUERY(A1:D5, "select *") or = QUERY(A1:D5, "select A, B, C, D") or convert data range into array and use this formula: = QUERY({A1:D5}, "sel...

Any list comprehension can be correspondingly coded with list monad's do notation. [f x | x <- xs] f <$> xs do { x <- xs ; return (f x) } [f x | f <- fs, x <- xs] fs <*> xs do { f <- fs ; x <- xs ; return (f x) } [y | x &...

Sometimes you want an installation without anything except the bare minimum phoenix setup. The follow command will give you that. mix phoenix.new web --no-brunch --no-ecto Note: You must have installed Elixir, Erlang, Hex, Mix and the Phoenix archive for skeleton installation

propreties { $isOk = $false } # By default the Build task won't run, unless there is a param $true Task Build -precondition { return $isOk } { "Build" } Task Clean { "Clean" } Task default -Depends Build

The instance_eval method is available on all objects. It evaluates code in the context of the receiver: object = Object.new object.instance_eval do @variable = :value end object.instance_variable_get :@variable # => :value instance_eval sets self to object for the duration of the c...

Many languages feature a with statement that allows programmers to omit the receiver of method calls. with can be easily emulated in Ruby using instance_eval: def with(object, &block) object.instance_eval &block end The with method can be used to seamlessly execute methods on object...

To detect multiple features at once, use the and operator. @supports (transform: translateZ(1px)) and (transform-style: preserve-3d) and (perspective: 1px) { /* Probably do some fancy 3d stuff here */ } There is also an or operator and a not operator: @supports (display: flex) or (display...

The qsort() standard library function is a good example of how one can use void pointers to make a single function operate on a large variety of different types. void qsort ( void *base, /* Array to be sorted */ size_t num, /...