Given a Person struct
struct Person {
let name: String
let birthYear: Int?
}
and an Array of Person(s)
let persons = [
Person(name: "Walter White", birthYear: 1959),
Person(name: "Jesse Pinkman", birthYear: 1984),
Person(name: "Skyler White&quo...
The ng-mouseenter and ng-mouseleave directives are useful to run events and apply CSS styling when you hover into or out of your DOM elements.
The ng-mouseenter directive runs an expression one a mouse enter event (when the user enters his mouse pointer over the DOM element this directive resides i...
HTTP describes how an HTTP client, such as a web browser, sends an HTTP request via a network to an HTTP server, which then sends an HTTP response back to the client.
The HTTP request is typically either a request for an online resource, such as a web page or image, but may also include additiona...
Custom Renderers let developers customize the appearance and behavior of Xamarin.Forms controls on each platform. Developers could use features of native controls.
For example, we need to disable scroll in ListView. On iOS ListView is scrollable even if all items are placed on the screen and user s...
Cheatsheet
DODON'TControl flow with control statementsControl flow with exceptionsKeep track of ignored (absorbed) exception by loggingIgnore exceptionRepeat exception by using throwRe-throw exception - throw new ArgumentNullException() or throw exThrow predefined system exceptionsThrow custom exce...
ng-app Sets the AngularJS section.
ng-init Sets a default variable value.
ng-bind Alternative to {{ }} template.
ng-bind-template Binds multiple expressions to the view.
ng-non-bindable States that the data isn't bindable.
ng-bind-html Binds inner HTML property of an HTML element....
Retrofit2 comes with support for multiple pluggable execution mechanisms, one of them is RxJava.
To use retrofit with RxJava you first need to add the Retrofit RxJava adapter to your project:
compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
then you need to add the adapter when building yo...
RxJava is handy when making serial request. If you want to use the result from one request to make another you can use the flatMap operator:
api.getRepo(repoId).flatMap(repo -> api.getUser(repo.getOwnerId())
.subscribe(/*do something with the result*/);
You can use the zip operator to make request in parallel and combine the results eg:
Observable.zip(api.getRepo(repoId1), api.getRepo(repoId2), (repo1, repo2) ->
{
//here you can combine the results
}).subscribe(/*do something with the result*/);
C++11 introduced core language and standard library support for moving an object. The idea is that when an object o is a temporary and one wants a logical copy, then its safe to just pilfer o's resources, such as a dynamically allocated buffer, leaving o logically empty but still destructible and co...
Placeholders allow you to feed values into a tensorflow graph. Aditionally They allow you to specify constraints regarding the dimensions and data type of the values being fed in. As such they are useful when creating a neural network to feed new training examples.
The following example declares a ...
In the following example a 2 by 3 tensor is multiplied by a scalar value (2).
# Build a graph
graph = tf.Graph()
with graph.as_default():
# A 2x3 matrix
a = tf.constant(np.array([[ 1, 2, 3],
[10,20,30]]),
dtype=tf.float32)
...
The dot product between two tensors can be performed using:
tf.matmul(a, b)
A full example is given below:
# Build a graph
graph = tf.Graph()
with graph.as_default():
# A 2x3 matrix
a = tf.constant(np.array([[1, 2, 3],
[2, 4, 6]]),
...
Variable tensors are used when the values require updating within a session. It is the type of tensor that would be used for the weights matrix when creating neural networks, since these values will be updated as the model is being trained.
Declaring a variable tensor can be done using the tf.Varia...
Set MONGO_URL to any arbitrary value except for a database URL and ensure no collections are defined in your Meteor project (including collections defined by Meteor packages) to run Meteor without MongoDB.
Note that without MongoDB, server/client methods alongside any packages related to Meteor's u...
XSS attacks consist in injecting HTML (or JS) code in a page. See What is cross site scripting for more information.
To prevent from this attack, by default, Django escapes strings passed through a template variable.
Given the following context:
context = {
'class_name': 'large" style=&...
The intent attribute of a dummy argument in a subroutine or function declares its intended use. The syntax is either one of
intent(IN)
intent(OUT)
intent(INOUT)
For example, consider this function:
real function f(x)
real, intent(IN) :: x
f = x*x
end function
The intent(IN) specif...
It is possible to create custom routing constraint which can be used inside routes to constraint a parameter to specific values or pattern.
This constrain will match a typical culture/locale pattern, like en-US, de-DE, zh-CHT, zh-Hant.
public class LocaleConstraint : IRouteConstraint
{
pri...
You can use raycasts to check if an ai can walk without falling off the edge of a level.
using UnityEngine;
public class Physics2dRaycast: MonoBehaviour
{
public LayerMask LineOfSightMask;
void FixedUpdate()
{
RaycastHit2D hit = Physics2D.Raycas...
Compare operation with collections - Create collections
1. Create List
DescriptionJDKguavags-collectionsCreate empty listnew ArrayList<>()Lists.newArrayList()FastList.newList()Create list from valuesArrays.asList("1", "2", "3")Lists.newArrayList("1", &...
