Tutorial by Examples: s

In lua, the logical operators and and or returns one of the operands as the result instead of a boolean result. As a consequence, this mechanism can be exploited to emulate the behavior of the ternary operator despite lua not having a 'real' ternary operator in the language. Syntax condition and...

NSMutableArray *array = [NSMutableArray arrayWithObjects:@"Ken", @"Tim", @"Chris", @"Steve",@"Charlie",@"Melissa", nil]; NSPredicate *bPredicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] 'c'"]; NSArray ...

String and character literals provide an escape mechanism that allows express character codes that would otherwise not be allowed in the literal. An escape sequence consists of a backslash character (\) followed by one ore more other characters. The same sequences are valid in both character an st...

Location is a service that applications can use to interact with a browser's URL. Depending on which LocationStrategy is used, Location will either persist to the URL's path or the URL's hash segment. Location is responsible for normalizing the URL against the application's base href. import {Comp...

The async pipe subscribes to an Observable or Promise and returns the latest value it has emitted. When a new value is emitted, the async pipe marks the component to be checked for changes. When the component gets destroyed, the async pipe unsubscribes automatically to avoid potential memory leaks. ...

import React, { Component } from 'react'; import { Modal, Text, View, Button, StyleSheet, } from 'react-native'; const styles = StyleSheet.create({ mainContainer: { marginTop: 22, }, modalContainer: { marginTop: 22, }, }); class Example extends Component...

#import <Foundation/Foundation.h> int main() { NSLog(@"File :%s\n", __FILE__ ); NSLog(@"Date :%s\n", __DATE__ ); NSLog(@"Time :%s\n", __TIME__ ); NSLog(@"Line :%d\n", __LINE__ ); NSLog(@"ANSI :%d\n", __STDC__ ); ...

You use it the same way you would use NSMutableDictionary. The difference is that when NSCache detects excessive memory pressure (i.e. it's caching too many values) it will release some of those values to make room. If you can recreate those values at runtime (by downloading from the Internet, by d...

Given data Const c a = Const c we have data Free (Const c) a = Pure a | Free (Const c) which is isomorphic to data Either c a = Right a | Left c

Given data Reader x a = Reader (x -> a) we have data Free (Reader x) a = Pure a | Free (x -> Free (Reader x) a) which is isomorphic to data Demand x a = Satisfied a | Hungry (x -> Demand x a) or equivalently Stream x -> a with data Stream x = Stream x...

Given data Const c a = Const c we have data Cofree (Const c) a = a :< Const c which is isomorphic to data Writer c a = Writer c a

Given data Identity a = Identity a we have data Cofree Identity a = a :< Identity (Cofree Identity a) which is isomorphic to data Stream a = Stream a (Stream a)

Given data Writer w a = Writer w a we have data Cofree (Writer w) a = a :< (w, Cofree (Writer w) a) which is equivalent to data Stream (w,a) = Stream (w,a) (Stream (w,a)) which can properly be written as WriterT w Stream with data WriterT w m a = WriterT (m (w,a))

The size of the content will be the same as that of its ScrollPane container. import javafx.scene.control.ScrollPane; //Import the ScrollPane import javafx.scene.control.ScrollPane.ScrollBarPolicy; //Import the ScrollBarPolicy import javafx.scene.layout.Pane; ScrollPane scrollpane; Pane con...

The size of the content will change depending on the added elements that exceed the content limits in both axes (horizontal and vertical) that can be seen by moving through the view. import javafx.scene.control.ScrollPane; //Import the ScrollPane import javafx.scene.control.ScrollPane.ScrollBar...

The appearance of the ScrollPane can be easily changed, by having some notions of "CSS" and respecting some control "properties" and of course having some "imagination". A) The elements that make up ScrollPane : B) CSS properties : .scroll-bar:vertical .track{} ...

The package clause is not directly binded with the file where it is found. It is possible to find common elements of the package clause in diferent files. For example, the package clauses bellow can be found in the file math1.scala and in the file math2.scala. File math1.scala package org { ...

While developing, inserting the following line to your code: assert False, value will cause django to raise an AssertionError with the value supplied as an error message when this line is executed. If this occurs in a view, or in any code called from a view, and DEBUG=True is set, a full and de...

Debugging takes time and effort. Instead of chasing bugs with a debugger, consider spending more time on making your code better by: Write and run Tests. Python and Django have great builtin testing frameworks - that can be used to test your code much faster than manually with a debugger. Writ...

constexpr const size_t addressSize = sizeof(sockaddr_in); constexpr const uint16_t defaultPort = 80; // The port you want to use int serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); sockaddr_in serverAddress, clientAddress; memset(&serverAddress, 0, addressSize); serverAddress....