Tutorial by Examples: is

An Akka MessageDispatcher is what makes Akka Actors "tick", it is the engine of the machine so to speak. All MessageDispatcher implementations are also an ExecutionContext, which means that they can be used to execute arbitrary code, for instance Futures. Every ActorSystem will have a def...

So in case you want to give your Actor a different dispatcher than the default, you need to do two things, of which the first is to configure the dispatcher in your application.conf: my-dispatcher { # Dispatcher is the name of the event-based dispatcher type = Dispatcher # What kind of Exe...

Listing docker-machines will return the state, address and version of Docker of each docker machines. docker-machine ls Will print something like: NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS docker-machine-1 - ovh Running ...

Here we demonstrate how to process lists recursively using OCaml's pattern matching syntax. let rec map f lst = match lst with | [] -> [] | hd::tl -> (f hd)::(map f tl) In this case, the pattern [] matches the empty list, while hd::tl matches any list that has at least one element...

OperatorComparisonExample==Equali == 0===Equal Value and Typei === "5"!=Not Equali != 5!==Not Equal Value or Typei !== 5>Greater thani > 5<Less thani < 5>=Greater than or equali >= 5<=Less than or equali <= 5

Comparison operators compare two values and return to you a boolean (True or False) as the result. Equality The equal sign = is used both for equality comparison and assignment. If leftValue = rightValue Then ... Inequality The left angle bracket nest to the right angle bracket <> p...

<svg width="900px" height="400px" viewBox="0 0 900 400"> <defs> <filter id="xAxisGaussian"> <feGaussianBlur stdDeviation="5 0"/> </filter> </defs> <image xlink:href=...

// Get the battery API navigator.getBattery().then(function(battery) { if (battery.charging) { console.log("Battery is charging"); } else { console.log("Battery is discharging"); } });

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will drain in ", battery.dischargingTime, " seconds" ); });

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will get fully charged in ", battery.chargingTime, " seconds" ); });

It's important to know how CMake distinguishes between lists and plain strings. When you write: set(VAR "a b c") you create a string with the value "a b c". But when you write this line without quotes: set(VAR a b c) You create a list of three items instead: "a", &q...

Can be used to show/hide DOM elements. Similar to using if, except that visible will still build the element and set display:none. <div data-bind="visible: shouldShowMessage"> You will see this message only when "shouldShowMessage" holds a true value. </div> ...

A XOR Linked list is also called a Memory-Efficient Linked List. It is another form of a doubly linked list. This is highly dependent on the XOR logic gate and its properties. Why is this called the Memory-Efficient Linked List? This is called so because this uses less memory than a traditional d...

PublishSubject emits to an Observer only those items that are emitted by the source Observable subsequent to the time of the subscription. A simple PublishSubject example: Observable<Long> clock = Observable.interval(500, TimeUnit.MILLISECONDS); Subject<Long, Long> subjectLong = Publi...

I have the following list: 1. Alon Cohen 2. Elad Yaron 3. Yaron Amrani 4. Yogev Yaron I want to select the first name of the guys with the Yaron surname. Since I don't care about what number it is I'll just put it as whatever digit it is and a matching dot and space after it from the beginni...

This is a very common workflow when using Ansible for provisioning an AWS EC2 instance. This post assumes a basic understand of Ansible and most importantly, assumes you've properly configured it to connect to AWS. As Ansible official documentation insists, we are going to use four roles: 1- ami_f...

import cv2 image_path= #put your image path here #use imread() function to read image data to variable img. img = cv2.imread(image_path) #display image data in a new window with title 'I am an image display window' cv2.imshow('I am an image display window',img) #wait until user hi...

The backface-visibility property relates to 3D transforms. With 3D transforms and the backface-visibility property, you're able to rotate an element such that the original front of an element no longer faces the screen. For example, this would flip an element away from the screen: JSFIDDLE <d...

Suppose you have complex code that creates and returns a list by starting with a blank list and repeatedly appending to it: def create(): result = [] # logic here... result.append(value) # possibly in several places # more logic... return result # possibly in several places...

C99 These functions returns the floating-point remainder of the division of x/y. The returned value has the same sign as x. Single Precision: #include <math.h> /* for fmodf() */ #include <stdio.h> /* for printf() */ int main(void) { float x = 10.0; float y = 5.1; ...