Tutorial by Topics: m

Middleware is a software component that will determine how to process the request and decide whether to pass it to the next component in the application pipeline. Each middleware has a vary specific role and actions to preform on the request.

include Comparable implement the space-ship operator (<=>) ParameterDetailsotherThe instance to be compared to self x <=> y should return a negative number if x < y, zero if x == y and a positive number if x > y.

lock (obj) {} Using the lock statement you can control different threads' access to code within the code block. It is commonly used to prevent race conditions, for example multiple threads reading and removing items from a collection. As locking forces threads to wait for other threads to ...

Approach with sealed trait and case objects is preferred because Scala enumeration has a few problems: Enumerations have the same type after erasure. Compiler doesn't complain about “Match is not exhaustive", if case is missed it will fail in runtime scala.MatchError: def isWeekendWith...

Android Marshmallow introduced Runtime Permission model. Permissions are categorized into two categories i.e. Normal and Dangerous Permissions. where dangerous permissions are now granted by the user at run time. From sdk 23 Android requires runtime permissions for permissions on devices runni...

All algorithms are a list of steps to solve a problem. Each step has dependencies on some set of previous steps, or the start of the algorithm. A small problem might look like the following: This structure is called a directed acyclic graph, or DAG for short. The links between each node in ...

Random number generation in C++ is provided by the <random> header. This header defines random devices, pseudo-random generators and distributions. Random devices return random numbers provided by operating system. They should either be used for initialization of pseudo-random generators or...

import {component} from 'libName'; // Will import the class "component" import {component as c} from 'libName'; // Will import the class "component" into a "c" object import component from 'libname'; // Will import the default export from libName import * as lib fr...

ParameterDescriptiontitleThe UIBarButtonItem titlestyleThe style of the UIBarButtonItemtargetThe object to receive the UIBarButtonItem actionactionThe selector (method) to be performed when the UIBarButtonItem is pressed Referencing self.navigationItem assumes that the UIViewController is embedde...

As database tables grow, it's often useful to limit the results of queries to a fixed number or percentage. This can be achieved using SQL Server's TOP keyword or OFFSET FETCH clause. ParameterDetailsTOPLimiting keyword. Use with a number.PERCENTPercentage keyword. Comes after TOP and limiting ...

ParameterDescriptionpath_or_bufstring or file handle, default None File path or object, if None is provided the result is returned as a string.sepcharacter, default ‘,’ Field delimiter for the output file.na_repstring, default ‘’ Missing data representationfloat_formatstring, default None Format st...

import itertools