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Syntax {condition-to-evaluate} ? {statement-executed-on-true} : {statement-executed-on-false} As shown in the syntax, the Conditional Operator (also known as the Ternary Operator1) uses the ? (question mark) and : (colon) characters to enable a conditional expression of two possible outcomes. It c...

To make express web application modular use router factories: Module: // greet.js const express = require('express'); module.exports = function(options = {}) { // Router factory const router = express.Router(); router.get('/greet', (req, res, next) => { res.end(options....

Selenium Grid Node configuration resides on the Node itself and holds the information about network configuration and Node capabilities. The configuration can be applied in various ways: Default Configuration JSON Configuration Command line Configuration JSON Configuration The node configur...

In general, most of the objects you would interact with as a user would tend to be a vector; e.g numeric vector, logical vector. These objects can only take in a single type of variable (a numeric vector can only have numbers inside it). A list would be able to store any type variable in it, making...

# example data test_sentences <- c("The quick brown fox quickly", "jumps over the lazy dog") Let's make the brown fox red: sub("brown","red", test_sentences) #[1] "The quick red fox quickly" "jumps over the lazy dog" Now, ...

Head over to CMake download page and get a binary for your operating system, e.g. Windows, Linux, or Mac OS X. On Windows double click the binary to install. On Linux run the binary from a terminal. On Linux, you can also install the packages from the distribution's package manager. On Ubuntu 16.0...

LibGDX has a fairly simple setup, with the help of a simple Java program. You can find the download here. When you startup the application, it will look something like this: Note: This screenshot have been taken on Linux and shows path that differs from a Windows installation. However, the form is...

This example assumes you have already installed Java and Gradle. Use the following project structure: src/ main/ java/ com/ example/ Application.java build.gradle build.gradle is your build script for Gradle build system with the following content: buildscri...

You should implement SFSafariViewControllerDelegate so that your class is notified when the user hits the Done button on the SafariViewController and you can dismiss it as well. First declare your class to implement the protocol. class MyClass: SFSafariViewControllerDelegate { } Implement th...

Don't forget to import the necessary framework first. import SafariServices //Objective-C @import SafariServices; Instantiate a SafariViewController instance. let safariVC = SFSafariViewController(URL: URL(string: "your_url")!) //Objective-C @import SafariServices; NSURL *URL = [...

Considering the following dictionary: d = {"a": 1, "b": 2, "c": 3} To iterate through its keys, you can use: for key in d: print(key) Output: "a" "b" "c" This is equivalent to: for key in d.keys(): print(key) ...

To split one component off of the path: >>> p = os.path.join(os.getcwd(), 'foo.txt') >>> p '/Users/csaftoiu/tmp/foo.txt' >>> os.path.dirname(p) '/Users/csaftoiu/tmp' >>> os.path.basename(p) 'foo.txt' >>> os.path.split(os.getcwd()) ('/Users/csafto...

Every package requires a setup.py file which describes the package. Consider the following directory structure for a simple package: +-- package_name | | | +-- __init__.py | +-- setup.py The __init__.py contains only the line def foo(): return 100. The following setup.py...

Let's say we have the following data: >>> data = {"cats": [{"name": "Tubbs", "color": "white"}, {"name": "Pepper", "color": "black"}]} Just dumping this as JSON does not do anything special here: ...

All built-in Clojure collections are immutable and heterogeneous, have literal syntax, and support the conj, count, and seq functions. conj returns a new collection that is equivalent to an existing collection with an item "added", in either "constant" or logarithmic time. Wha...

For if you have to fine-tune what is published. import { Mongo } from 'meteor/mongo'; import { Meteor } from 'meteor/meteor'; import { Random } from 'meteor/random'; if (Meteor.isClient) { // established this collection on the client only. // a name is required (first parameter) and this...

On the server, you can create a publication like this. this.userId is the id of the user who is currently logged in. If no user is logged in, you might want to throw an error and respond to it. import Secrets from '/imports/collections/Secrets'; Meteor.publish('protected_data', function () { ...

Swift 3 let stackView = UIStackView() stackView.axis = .horizontal stackView.alignment = .fill // .leading .firstBaseline .center .trailing .lastBaseline stackView.distribution = .fill // .fillEqually .fillProportionally .equalSpacing .equalCentering let label = UILabel() label.text = "...

Using the dateutil library as in the previous example on parsing timezone-aware timestamps, it is also possible to parse timestamps with a specified "short" time zone name. For dates formatted with short time zone names or abbreviations, which are generally ambiguous (e.g. CST, which coul...

By default all datetime objects are naive. To make them timezone-aware, you must attach a tzinfo object, which provides the UTC offset and timezone abbreviation as a function of date and time. Fixed Offset Time Zones For time zones that are a fixed offset from UTC, in Python 3.2+, the datetime mod...