Tutorial by Examples: er

this will accept any type with a method named GetLength that takes nothing and returns an int: ((^a : (static member GetLength : int) ()))

Yank all lines containing TODO into a register by using append operation :global/TODO/yank A Here, we are searching for a TODO keyword globally, yanking all lines into register a (A register appends all lines to a register). NOTE: It is in general a good practice to clear a register before perf...

If constraints for std::promise and std::future are not met an exception of type std::future_error is thrown. The error code member in the exception is of type std::future_errc and values are as below, along with some test cases: enum class future_errc { broken_promise = /* the t...

The gross majority of the time a SyntaxError which points to an uninteresting line means there is an issue on the line before it (in this example, it's a missing parenthesis): def my_print(): x = (1 + 1 print(x) Returns File "<input>", line 3 print(x) ^...

nameNode=hdfs://namenode:port start=2016-04-12T06:00Z end=2017-02-26T23:25Z jobTracker=yourjobtracker poolName=yourpool oozie.coord.application.path=${nameNode}/hdfs_path/coord_job_example/coord workflowAppUri=${oozie.coord.application.path} myscript=myscript.sh myscriptPath=${oozie.coord.ap...

Creating Express Web Server Express server came handy and it deeps through many user and community. It is getting popular. Lets create a Express Server. For Package Management and Flexibility for Dependency We will use NPM(Node Package Manager). Go to the Project directory and create package....

# Error messages should not go to standard output, if possible. print('ERROR: We have no cheese at all.', file=sys.stderr) try: f = open('nonexistent-file.xyz', 'rb') except OSError as e: print(e, file=sys.stderr)

This example contains over 1000 lines of code in total (too much to be embedded here). For that reason all code is accessible on http://blockbuilder.org/SumNeuron/956772481d4e625eec9a59fdb9fbe5b2 (alternatively hosted at https://bl.ocks.org/SumNeuron/956772481d4e625eec9a59fdb9fbe5b2). Note the bl.oc...

To show the value of making generalized functions like those in the previous example (make_title, make_axes, make_buttons, etc), consider this box and whisker chart: https://bl.ocks.org/SumNeuron/262e37e2f932cf4b693f241c52a410ff While the code for making the boxes and whiskers is more intensive tha...

In production environment, we often do not want to display any error message to the users. It is good if it is enabled in the development environment for debugging purposes. These error messages may contain some information, which we should not show to the site users for security reasons. There are...

// XSS Filtering $data = array( 'name'=> '<script>Abuse Data</script>' ); $data = $this->security->xss_clean($data); // Clean Data // Escaping Queries <?php $username = $this->input->post('username'); $query = 'SELECT * FROM subscribers_tbl ...

Don't rely on any user input. user input everything like <script> tag or any javascript alert(); so we have to prevent this all data will no run in our browser. so we have to use xss prevention method to restrict our secure data to kept in hacker hand and also it's developer's responsibility t...

<?php // Setting parameters $time = time(); $values = [7, $time, $time]; // Prints "At 3:50:31 PM on Apr 19, 2015, there was a disturbance on planet 7." $pattern = "At {1, time} on {1, date}, there was a disturbance on planet {0, number}."; $formatter = new Messa...

Suppose you had an array: pair = ['Jack','Jill'] And a method that takes two arguments: def print_pair (a, b) puts "#{a} and #{b} are a good couple!" end You might think you could just pass the array: print_pair(pair) # wrong number of arguments (1 for 2) (ArgumentError) Si...

The splat operator removes individual elements of an array and makes them into a list. This is most commonly used to create a method that accepts a variable number of arguments: # First parameter is the subject and the following parameters are their spouses def print_spouses(person, *spouses) s...

Example: > cat example.txt TODO: complete this NOT this NOT that TODO: Complete that Open the example.txt using vim and type :v/TODO/d in the Ex mode. This will delete all lines that do not contain the TODO pattern.

The following prints the current caller class. Note that in this case, the StackWalker needs to be created with the option RETAIN_CLASS_REFERENCE, so that Class instances are retained in the StackFrame objects. Otherwise an exception would occur. public class StackWalkerExample { public stat...

A couple of other options allow stack traces to include implementation and/or reflection frames. This may be useful for debugging purposes. For instance, we can add the SHOW_REFLECT_FRAMES option to the StackWalker instance upon creation, so that the frames for the reflective methods are printed as ...

NOTE: we're only doing this for Chrome at the moment Windows For Windows we need to download version 2.29 http://chromedriver.storage.googleapis.com/index.html?path=2.29/ Once downloaded, extract the zip to a location of your choice Add the location of the driver to the PATH Make sure the lat...

Symfony 2.8 # AppBundle\Twig\AppExtension.php <?php namespace AppBundle\Twig; class AppExtension extends \Twig_Extension { /** * This is where one defines the filters one would to use in their twig * templates * * @return Array */ public function ...