When creating a subscription for a user, you first need to create and activate a billing plan that a user is then subscribed to using a billing agreement. The full process for creating a subscription is detailed in the remarks of this topic.
Within this example, we're going to be using the PayPal N...
object HelloWorld extends App {
println("Hello, world!")
}
Live demo
By extending the App trait, you can avoid defining an explicit main method. The entire body of the HelloWorld object is treated as "the main method".
2.11.0
Delayed Initialization
Per the official d...
When working with dictionaries, it's often necessary to access all the keys and values in the dictionary, either in a for loop, a list comprehension, or just as a plain list.
Given a dictionary like:
mydict = {
'a': '1',
'b': '2'
}
You can get a list of keys using the keys() method:
...
Conditional comments can be used to customize code for different versions of Microsoft Internet Explorer. For example, different HTML classes, script tags, or stylesheets can be provided. Conditional comments are supported in Internet Explorer versions 5 through 9. Older and newer Internet Explorer ...
2.0
Guard checks for a condition, and if it is false, it enters the branch. Guard check branches must leave its enclosing block either via return, break, or continue (if applicable); failing to do so results in a compiler error. This has the advantage that when a guard is written it's not possible ...
An if statement checks whether a Bool condition is true:
let num = 10
if num == 10 {
// Code inside this block only executes if the condition was true.
print("num is 10")
}
let condition = num == 10 // condition's type is Bool
if condition {
print("num is 10&...
Optionals must be unwrapped before they can be used in most expressions. if let is an optional binding, which succeeds if the optional value was not nil:
let num: Int? = 10 // or: let num: Int? = nil
if let unwrappedNum = num {
// num has type Int?; unwrappedNum has type Int
print(&quo...
To allow the use of in for custom classes the class must either provide the magic method __contains__ or, failing that, an __iter__-method.
Suppose you have a class containing a list of lists:
class ListList:
def __init__(self, value):
self.value = value
# Create a set of al...
var favoriteColors: Set = ["Red", "Blue", "Green"]
//favoriteColors = {"Blue", "Green", "Red"}
You can use the insert(_:) method to add a new item into a set.
favoriteColors.insert("Orange")
//favoriteColors = {"Red&q...
To load jQuery from the official CDN, go to the jQuery website. You'll see a list of different versions and formats available.
Now, copy the source of the version of jQuery, you want to load. Suppose, you want to load jQuery 2.X, click uncompressed or minified tag which will show you something li...
Import the ElementTree object, open the relevant .xml file and get the root tag:
import xml.etree.ElementTree as ET
tree = ET.parse("yourXMLfile.xml")
root = tree.getroot()
There are a few ways to search through the tree. First is by iteration:
for child in root:
print(child.ta...
(Note: All examples using let are also valid for const)
var is available in all versions of JavaScript, while let and const are part of ECMAScript 6 and only available in some newer browsers.
var is scoped to the containing function or the global space, depending when it is declared:
var x = 4; /...
By default, a Date object is created as local time. This is not always desirable, for example when communicating a date between a server and a client that do not reside in the same timezone. In this scenario, one doesn't want to worry about timezones at all until the date needs to be displayed in lo...
A very simple way to import data from many common file formats is with rio. This package provides a function import() that wraps many commonly used data import functions, thereby providing a standard interface. It works simply by passing a file name or URL to import():
import("example.csv"...
Final classes
When used in a class declaration, the final modifier prevents other classes from being declared that extend the class. A final class is a "leaf" class in the inheritance class hierarchy.
// This declares a final class
final class MyFinalClass {
/* some code */
}
...
