Tutorial by Examples: e

Actually any value different from NIL is considered a true value in Common Lisp. For instance: CL-USER> (let ((a (+ 2 2))) (if a a "Oh my! 2 + 2 is equal to NIL!")) 4 This fact can be combined with the boolean operators to make programs m...

R has a number of build in constants. The following constants are available: LETTERS: the 26 upper-case letters of the Roman alphabet letters: the 26 lower-case letters of the Roman alphabet month.abb: the three-letter abbreviations for the English month names month.name: the English names fo...

The command prompt comes pre-installed on all Windows NT, Windows CE, OS/2 and eComStation operating systems, and exists as cmd.exe, typically located in C:\Windows\system32\cmd.exe On Windows 7 the fastest ways to open the command prompt are: Press Win 𐌎, type "cmd" and then press ...

Any ASCII editor can edit batch files. A list of editors that can syntax highlight batch syntax can be found here. You can also use the default notepad shipped with windows to edit and view a batch file, although it does not offer syntax highlighting. To open notepad: Press Win 𐌎+R, type notepa...

To get help on a batch file command you can use the built-in help. Open a command prompt (whose executable is cmd.exe) and enter help to see all available commands. To get help for any of these commands, type help followed by the name of the command. For example: help help Will display: Prov...

This quickstart is written for Mac OSX Mavericks, and is a bit more verbose than other installation instructions. It should hopefully cover a few edge cases, such as setting your path, and configuring NPM, which can cause an installation to go awry. # install node # as of OSX Mavericks, we...

This quickstart is written for Mac OSX Mavericks, and is a bit more verbose than other installation instructions. It should hopefully cover a few edge cases, such as setting your path, and configuring NPM, which can cause an installation to go awry. # install meteor curl https://install.meteor...

# install node-inspector terminal-a$ npm install -g node-inspector # start meteor terminal-a$ cd helloworld terminal-a$ NODE_OPTIONS='--debug-brk --debug' mrt run # alternatively, some people report this syntax being better terminal-a$ sudo NODE_OPTIONS='--debug' ROOT_URL=http://hellow...

To enable translation in templates you must load the i18n library. {% load i18n %} Basic translation is made with the trans template tag. {% trans "Some translatable text" %} {# equivalent to python `ugettext("Some translatable text")` #} The trans template tag supports ...

I have the following list: 1. Alon Cohen 2. Elad Yaron 3. Yaron Amrani 4. Yogev Yaron I want to select the first name of the guys with the Yaron surname. Since I don't care about what number it is I'll just put it as whatever digit it is and a matching dot and space after it from the beginni...

HTML <div id="app"></div> JS document.getElementById('app').innerHTML = '<p>Some text</p>' and now HTML looks like this <div id="app"> <p>Some text</p> </div>

One could easily center a child element using table display property. HTML <div class="wrapper"> <div class="parent"> <div class="child"></div> </div> </div> CSS .wrapper { display: table; vertica...

Cache-Control: public, max-age=31536000 public means the response is the same for all users (it does not contain any personalized information). max-age is in seconds from now. 31536000 = 60 * 60 * 24 * 365. This is recommended for static assets that are never meant to change.

Cache-Control: private, max-age=60 private specifies that the response can be cached only for user who requested the resource, and can't be reused when other users request the same resource. This is appropriate for responses that depend on cookies.

Cache-Control: no-cache The client will behave as if the response was not cached. This is appropriate for resources that can unpredictably change at any time, and which users must always see in the latest version. Responses with no-cache will be slower (high latency) due to need to contact the s...

Cache-control: no-store Instructs clients no to cache the response in any way, and to forget it at soon as possible. This directive was originally designed for sensitive data (today HTTPS should be used instead), but can be used to avoid polluting caches with responses that can't be reused. It...

Expires — specifies date when the resource becomes stale. It relies on servers and clients having accurate clocks and supporting time zones correctly. Cache-control: max-age takes precedence over Expires, and is generally more reliable. post-check and pre-check directives are non-standard I...

DateTime date = new DateTime(2016, 07, 06, 18, 30, 14); // Format: year, month, day hours, minutes, seconds Console.Write(String.Format("{0:dd}",date)); //Format by Culture info String.Format(new System.Globalization.CultureInfo("mn-MN"),"{0:dddd}",date); 6....

Single Pointers Pointer to an int The pointer can point to different integers and the int's can be changed through the pointer. This sample of code assigns b to point to int b then changes b's value to 100. int b; int* p; p = &b; /* OK */ *p = 100; /* OK */ Pointer to a cons...

To send a remote command via SSH (the SSH server needs to be running on the remote host), you can simply write the command after user@machine. ssh alice@example.com echo 'Hello World' Hello World It returns back the output to the sender, executed on the remote host.