git rev-list --oneline master ^origin/master
Git rev-list will list commits in one branch that are not in another branch. It is a great tool when you're trying to figure out if code has been merged into a branch or not.
Using the --oneline option will display the title of each commit.
The ^ ...
For Alerts since iOS 8, you would use a UIAlertController but for versions before, you would have used a UIAlertView, which is now deprecated.
8.0
var alert = UIAlertController.Create(title, message, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create(otherTitle, UIAlertActionStyl...
We can make an AJAX request to Stack Exchange's API to retrieve a list of the top JavaScript questions for the month, then present them as a list of links. If the request fails or the returns an API error, our promise error handling displays the error instead.
6
View live results on HyperWeb.
c...
Use the --number flag to print line numbers before each line. Alternatively, -n does the same thing.
$ cat --number file
1 line 1
2 line 2
3
4 line 4
5 line 5
To skip empty lines when counting lines, use the --number-nonblank, or simply -b.
$ cat -b file
1 line 1
2 line ...
Browse to File > New > Project to bring you up the New Project dialog.
Navigate to Visual C# > iOS > iPhone and select Single View App:
Give your app a Name and press OK to create your project.
Select the Mac Agent icon from the toolbar, as illustrated below:
Select the Mac tha...
What is hoisting?
Hoisting is a mechanism which moves all variable and function declarations to the top of their scope. However, variable assignments still happen where they originally were.
For example, consider the following code:
console.log(foo); // → undefined
var foo = 42;
console.log(fo...
Employ the EAFP coding style and try to open it.
import errno
try:
with open(path) as f:
# File exists
except IOError as e:
# Raise the exception if it is not ENOENT (No such file or directory)
if e.errno != errno.ENOENT:
raise
# No such file or directory
...
const fs = require('fs');
// Read the contents of the directory /usr/local/bin asynchronously.
// The callback will be invoked once the operation has either completed
// or failed.
fs.readdir('/usr/local/bin', (err, files) => {
// On error, show it and return
if(err) return console.er...
Let's say you've got a list of restaurants -- maybe you read it from a file. You care about the unique restaurants in the list. The best way to get the unique elements from a list is to turn it into a set:
restaurants = ["McDonald's", "Burger King", "McDonald's", &qu...
jQuery code is often wrapped in jQuery(function($) { ... }); so that it only runs after the DOM has finished loading.
<script type="text/javascript">
jQuery(function($) {
// this will set the div's text to "Hello".
$("#myDiv").text("Hello"...
Use the isset() function upon the superglobal $_COOKIE variable to check if a cookie is set.
Example:
// PHP <7.0
if (isset($_COOKIE['user'])) {
// true, cookie is set
echo 'User is ' . $_COOKIE['user'];
else {
// false, cookie is not set
echo 'User is not logged in';
}
...
One of the most common tasks is retrieving an existing element from the DOM to manipulate. Most commonly these methods are executed on document, because it is the root node, but all these methods work on any HTML element in the tree. They will only return children from the node it is executed on.
R...
Function overloading is having multiple functions declared in the same scope with the exact same name exist in the same place (known as scope) differing only in their signature, meaning the arguments they accept.
Suppose you are writing a series of functions for generalized printing capabilities, b...
To get started with the jQuery UI library, you'll need to add the jQuery script, the jQuery UI script, and the jQuery UI stylesheet to your HTML.
First, download jQuery UI; choose the features you need on the download page. Unzip your download, and put jquery-ui.css and jquery-ui.js (and jquery.js)...
A common pitfall is confusing the equality comparison operators is and ==.
a == b compares the value of a and b.
a is b will compare the identities of a and b.
To illustrate:
a = 'Python is fun!'
b = 'Python is fun!'
a == b # returns True
a is b # returns False
a = [1, 2, 3, 4, 5]
b = a ...
Standard Collections
Java Collections framework
A simple way to construct a List from individual data values is to use java.utils.Arrays method Arrays.asList:
List<String> data = Arrays.asList("ab", "bc", "cd", "ab", "bc", "cd");
...
If you are using the PASSWORD_DEFAULT method to let the system choose the best algorithm to hash your passwords with, as the default increases in strength you may wish to rehash old passwords as users log in
<?php
// first determine if a supplied password is valid
if (password_verify($plaintex...
window.isNaN()
The global function isNaN() can be used to check if a certain value or expression evaluates to NaN. This function (in short) first checks if the value is a number, if not tries to convert it (*), and then checks if the resulting value is NaN. For this reason, this testing method may ...
Following ways can be used for joining lists without modifying source list(s).
First approach. Has more lines but easy to understand
List<String> newList = new ArrayList<String>();
newList.addAll(listOne);
newList.addAll(listTwo);
Second approach. Has one less line but less readab...
