Tutorial by Examples: d

Random UUID Swift func randomUUID() -> NSString{ return NSUUID.UUID().UUIDString() } Objective-C + (NSString *)randomUUID { if(NSClassFromString(@"NSUUID")) { // only available in iOS >= 6.0 return [[NSUUID UUID] UUIDString]; } CFUUIDRef uuidRef = ...

server { listen 80 default_server; listen [::]:80 default_server; server_name example.com www.example.com; return 307 https://$host$request_uri; } A 301 redirect is also an alternative but if a POST is made to a 301, then many clients will resubmit the request as a GET - whic...

server { server_name example.com; return 301 $scheme://example.net$request_uri; }

1.8 Run: $ git mv old/path/to/module new/path/to/module 1.8 Edit .gitmodules and change the path of the submodule appropriately, and put it in the index with git add .gitmodules. If needed, create the parent directory of the new location of the submodule (mkdir -p new/path/to). M...

One way to calculate the Big-O value of a procedure you've written is to determine which line of code runs the most times in your function, given your input size n. Once you have that number, take out all but the fastest-growing terms and get rid of the coefficents - that is the Big-O notation of yo...

DockPanel aligns the control according to the dock property, in the order it's placed in the control. NOTE: DockPanel is part of the WPF framework, but does not come with Silverlight/WinRT/UWP. Open-source implementations are easy to find though. <DockPanel LastChildFill="False"> ...

Grid is used to create table layouts. Basic rows and columns definitions <Grid> <!-- Define 3 columns with width of 100 --> <Grid.ColumnDefinitions> <ColumnDefinition Width="100"/> <ColumnDefinition Width="100"/> <ColumnDefi...

Locally created images can be pushed to Docker Hub or any other docker repo host, known as a registry. Use docker login to sign in to an existing docker hub account. docker login Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https...

Run the install on a single run command to merge the update and install. If you add more packages later, this will run the update again and install all the packages needed. If the update is run separately, it will be cached and package installs may fail. Setting the frontend to noninteractive and pa...

Open Repo Create new repo (My advice first add pods on a temporary repo before adding to your original project) Fill Repository name with your repo name. I'll use "myrepo" for this tutorial and will use "<" and ">" symbols for the parts you should change to yo...

To get the IP address of a docker machine, you can do that with this command : docker-machine ip machine-name

Dim aList as New List(Of Integer) aList.Add(1) aList.Add(10) aList.Add(1001) To add more than one item at a time use AddRange. Always adds to the end of the list Dim blist as New List(of Integer) blist.AddRange(alist) Dim aList as New List(of String) alist.AddRange({"one", &...

In this example, we simply create and show a push button in a window frame on the desktop. The push button will have the label Hello world! This represents the simplest possible Qt program. First of all we need a project file: helloworld.pro QT += core gui greaterThan(QT_MAJOR_VERSION, ...

gitk path/to/myfile

Let's say you have two commits d9e1db9 and 5651067 and want to see what happened between them. d9e1db9 is the oldest ancestor and 5651067 is the final descendant in the chain of commits. gitk --ancestry-path d9e1db9 5651067

If you have the version tag v2.3 you can display all commits since that tag. gitk v2.3..

Java provides a conditional-and and a conditional-or operator, that both take one or two operands of type boolean and produce a boolean result. These are: && - the conditional-AND operator, || - the conditional-OR operators. The evaluation of <left-expr> && <righ...

Write formatted data to string int sprintf ( char * str, const char * format, ... ); use sprintf function to write float data to string. #include <stdio.h> int main () { char buffer [50]; double PI = 3.1415926; sprintf (buffer, "PI = %.7f", PI); printf ("%s\n&...

Update your project with git pull origin master Update s.version inside MyRepo.podspec Check local errors with pod lib lint MyRepo.podspec git add . & git commit -m "Update pods version" git push origin master Make a new release pod trunk push MyRepo.podspec Source

Consider the Node class having 3 members data, left child pointer and right child pointer like below. public class Node { public int data; public Node left; public Node right; public Node(int data){ this.data = data; } } We can traverse the tree construct...