Join parent objects with their child entities, for example we want a relational table of each person and their hobbies
DECLARE @json nvarchar(1000) =
N'[
{
"id":1,
"user":{"name":"John"},
"hobbies":[
{...
Here we have a simple class to be tested that returns a Promise based on the results of an external ResponseProcessor that takes time to execute.
For simplicty we'll assume that the processResponse method won't ever fail.
import {processResponse} from '../utils/response_processor';
const ping =...
A local name for an import can be given, through which all references to the module's symbols must be qualified with:
import io = std.stdio;
void main()
{
io.writeln("Hello world");
std.stdio.writeln("hello!"); // error, std is undefined
writeln("hello!&qu...
You can re-use a moved object:
void consumingFunction(std::vector<int> vec) {
// Some operations
}
int main() {
// initialize vec with 1, 2, 3, 4
std::vector<int> vec{1, 2, 3, 4};
// Send the vector by move
consumingFunction(std::move(vec));
// Here...
Suppose, that we have three users :
The Administrator of the database > admin
The application with a full access for her data > read_write
The read only access > read_only
--ACCESS DB
REVOKE CONNECT ON DATABASE nova FROM PUBLIC;
GRANT CONNECT ON DATABASE nova TO user;
With th...
Media queries allow one to apply CSS rules based on the type of device / media (e.g. screen, print or handheld) called media type, additional aspects of the device are described with media features such as the availability of color or viewport dimensions.
General Structure of a Media Query
@media ...
For multiple quotechars use regex in place of sep:
df = pd.read_csv(log_file,
sep=r'\s(?=(?:[^"]*"[^"]*")*[^"]*$)(?![^\[]*\])',
engine='python',
usecols=[0, 3, 4, 5, 6, 7, 8],
names=['ip', 'time', 'request', 'statu...
var pattern = createPattern(imageObject,repeat)
Creates a reusable pattern (object).
The object can be assigned to any strokeStyle and/or fillStyle.
Then stroke() or fill() will paint the Path with the pattern of the object.
Arguments:
imageObject is an image that will be used as a patter...
This function executes an AJAX request using the HEAD method allowing us to check whether a file exists in the directory given as an argument. It also enables us to launch a callback for each case (success, failure).
function fileExists(dir, successCallback, errorCallback) {
var xhttp = new XM...
You can also perform this task recursively, but I have chosen in this example to use an iterative approach. This task is useful if you are inserting all of your nodes at the beginning of a linked list. Here is an example:
#include <stdio.h>
#include <stdlib.h>
#define NUM_ITEMS 10...
Given this setup code:
var dict = new Dictionary<int, string>()
{
{ 1, "First" },
{ 2, "Second" },
{ 3, "Third" }
};
Use the Remove method to remove a key and its associated value.
bool wasRemoved = dict.Remove(2);
Executing this code remo...
Julia provides macros to simplify distributing computation across multiple machines or workers. For instance, the following computes the sum of some number of squares, possibly in parallel.
function sumofsquares(A)
@parallel (+) for i in A
i ^ 2
end
end
Usage:
julia> sumo...
The most common conditional in Julia is the if...else expression. For instance, below we implement the Euclidean algorithm for computing the greatest common divisor, using a conditional to handle the base case:
mygcd(a, b) = if a == 0
abs(b)
else
mygcd(b % a, a)
end
The if...else for...
If you want to change an attribute of a control such as a textbox or label from another thread than the GUI thread that created the control, you will have to invoke it or else you might get an error message stating:
"Cross-thread operation not valid: Control 'control_name' accessed from a th...
This example will show you how you can resolve data fetched from a service before rendering your application's view.
Uses angular/router 3.0.0-beta.2 at the time of writing
users.service.ts
...
import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Rx';
import { User ...
$string = "a;b;c\nd;e;f";
// $1, $2 and $3 represent the first, second and third capturing groups
echo preg_replace("(^([^;]+);([^;]+);([^;]+)$)m", "$3;$2;$1", $string);
Outputs
c;b;a
f;e;d
Searches for everything between semicolons and reverses the order.
WPF introduces a very handy concept: The ability to store data as a resource, either locally for a control, locally for the entire window or globally for the entire application. The data can be pretty much whatever you want, from actual information to a hierarchy of WPF controls. This allows you to ...
Sharing a simple string was easy, but you can do much more. In this example, I'll also store a complete array of strings, along with a gradient brush to be used for the background. This should give you a pretty good idea of just how much you can do with resources:
<Window x:Class="WPFApplic...
If you only need a given resource for a specific control, you can make it more local by adding it to this specific control, instead of the window. It works exactly the same way, the only difference being that you can now only access from inside the scope of the control where you put it:
<StackPa...
