Tutorial by Examples: du

Code coverage is a measure used to how often each source code statement and branch is executed. This measure is usually required when running a test suite to ensure that as much of the code as possible is tested by the test suite. It can also be used during profiling to determine code hot-spots and ...

public class TestngAnnotation { // test case 1 @Test public void testCase1() { System.out.println("in test case 1"); } // test case 2 @Test public void testCase2() { System.out.println("in test case 2"); } @BeforeMethod pu...

Suppose that we have a text and a pattern. We need to determine if the pattern exists in the text or not. For example: +-------+---+---+---+---+---+---+---+---+ | Index | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | +-------+---+---+---+---+---+---+---+---+ | Text | a | b | c | b | c | g | l | x | +-------...

Suppose we have an array: +-------+-----+-----+-----+-----+-----+-----+ | Index | 0 | 1 | 2 | 3 | 4 | 5 | +-------+-----+-----+-----+-----+-----+-----+ | Value | -1 | 3 | 4 | 0 | 2 | 1 | +-------+-----+-----+-----+-----+-----+-----+ We want to perform some query on thi...

Dynamic programming solves problems by combining the solutions to subproblems. It can be analogous to divide-and-conquer method, where problem is partitioned into disjoint subproblems, subproblems are recursively solved and then combined to find the solution of the original problem. In contrast, dyn...

Eloquent relationships are defined as functions on your Eloquent model classes. Since, like Eloquent models themselves, relationships also serve as powerful query builders, defining relationships as functions provides powerful method chaining and querying capabilities. For example, we may chain addi...

Dynamic Time Warping(DTW) is an algorithm for measuring similarity between two temporal sequences which may vary in speed. For instance, similarities in walking could be detected using DTW, even if one person was walking faster than the other, or if there were accelerations and decelerations during ...

Weighted Job Scheduling Algorithm can also be denoted as Weighted Activity Selection Algorithm. The problem is, given certain jobs with their start time and end time, and a profit you make when you finish the job, what is the maximum profit you can make given no two jobs can be executed in parallel...

Problem ConcurrentDictionary shines when it comes to instantly returning of existing keys from cache, mostly lock free, and contending on a granular level. But what if the object creation is really expensive, outweighing the cost of context switching, and some cache misses occur? If the same key ...

Most Rx operators take an optional scheduler on which to schedule their future iterations. If not supplied they will use their default configured scheduler. Supplying a scheduler can be useful for testing purposes in which we like to talk about virtual time instead of real time for speed of test exe...

We have a set of jobs J={a,b,c,d,e,f,g}. Let j in J be a job than its start at sj and ends at fj. Two jobs are compatible if they don't overlap. A picture as example: The goal is to find the maximum subset of mutually compatible jobs. There are several greedy approaches for this problem: Earli...

In order to create a scheduler,the entry needs to be created in liferay-portlet.xml provding scheduler class and trigger value for timing of scheduler triggering <portlet-name>GetSetGo</portlet-name> <icon>/icon.png</icon> <scheduler-entry> ...

Take a use case, like a chat app or a collaborative grocery list app (that basically requires a list of objects to be synced across users). If you use firebase database and add a value event listener to the chat parent node or grocery list parent node, you will end with entire chat structure from th...

Joda-Time is a robust alternative to the Java date and time classes. Prior to Java SE 8, the standard Java date and time classes like java.util.Calendar are difficult to use and prone to errors. Joda-Time emerged as the de-facto standard library for date and time manipulation in many open-source-pr...

A LocalDate is a date without a timezone. Consider using them when you are only concerned with the year, month, and day of month and are not interested in an exact time. For example, when we write our date of birth (such as 1960-01-01) we don't care about the timezone in which it happened.

Available since Rails 4.2, Active Job is a framework for declaring jobs and making them run on a variety of queuing backends. Recurring or punctual tasks that are not blocking and can be run in parallel are good use cases for Active Jobs.

Anonymous pipes, or simply pipes, are kernel-managed objects exposed to processes as a pair of file descriptors, one for the read terminus and one for the write terminus. They are created via the pipe(2) function: int pipefds[2]; int result; result = pipe(pipefds); On success, pipe() record...

Consider the ranges A1:A3 and B1:B3 having the same size and only number values, as below =SUMPRODUCT(A1:A3,B1:B3) This will loop through the ranges, taking the product of values in the same row and summing them, returning 32 in this example. A1*B1 = 4 A2*B2 = 10 A3*B3 = 18

Consider the following ranges A1:A3 and B1:B3 as below =SUMPRODUCT(--(A1:A3="c"),B1:B3) This will first manipulate (A1:A3="c") into the following array A1="c" = FALSE A2="c" = FALSE A3="c" = TRUE Then apply the -- operator which converts...

Go to the Bitbucket repository you want to add users to. On the left, go to Settings (the last icon on the bottom left). Select Users and group access. Under Users, start typing the name or email address of the user whom you want to add. Select the privilege you want to grant that user (Read, ...