Tutorial by Examples: f

$ provides an easy and a concise method to concatenate multiple strings. var str1 = "text1"; var str2 = " "; var str3 = "text3"; string result2 = $"{str1}{str2}{str3}"; //"text1 text3"

Since BackAndroid is deprecated. Use BackHandler instead of BackAndroid. import { BackHandler } from 'react-native'; {...} ComponentWillMount(){ BackHandler.addEventListener('hardwareBackPress',()=>{ if (!this.onMainScreen()) { this.goBack(); return true; ...

Anonymous functions technique uses the fact that CALL command uses internally GOTO when subroutine is called and abusing help message printing with variable double expansion: @echo off setlocal set "anonymous=/?" call :%%anonymous%% a b c 3>&1 >nul if "%0" == ...

Lets have the following file called library.cmd : @echo off echo -/-/- Batch Functions Library -/-/- :function1 echo argument1 - %1 goto :eof To execute only the :function1 without the code of the rest of the file you should put a label :function1 in the caller bat and use it lik...

Parent element html <child-component [isSelected]="inputPropValue"></child-component> Parent element ts export class AppComponent { inputPropValue: true } Child component ts: export class ChildComponent { @Input() inputPropValue = false; } Child compone...

The easiest way to connect via curl to a different server is to alter the hosts file on your machine. On Linux and Unix systems, the hosts file is located in /etc/hosts, while on Windows systems it will be located in c:\windows\system32\drivers\etc\hosts. Once you open the file with a text editor ...

The most effective way to resolve curl to a different server is to use the --resolve option. This option will insert the address into curl's DNS cache, so it will effectively make curl believe that's the address it got when it resolved the name. Like so: curl --resolve eaxmple.com:80:1.2.3.4 http:...

Lets have the following example.bat and call it with arguments 1 ,2 and 3: @echo off ( shift shift echo %1 ) As the variable expansion will change after the the end brackets context is reached the output will be: 1 As this might be an issue when shifting inside brackets ...

I wrote a simple C code foo.c int main() { int i = 0; int j = 0; for (i = 0; i < 5; i++) { j = i + 1; } return 0; } When compiled with -O0 i.e. by disabling all compiler optimizations $ gcc -o foo.S foo.c -O0 -S I got this: .file "foo.c&...

Option Explicit #If Win64 Then 'Win64 = True, Win32 = False, Win16 = False Private Declare PtrSafe Sub apiCopyMemory Lib "Kernel32" Alias "RtlMoveMemory" (MyDest As Any, MySource As Any, ByVal MySize As Long) Private Declare PtrSafe Sub apiExitProcess Lib "Kern...

#ElseIf Win32 Then 'Win32 = True, Win16 = False Private Declare Sub apiCopyMemory Lib "Kernel32" Alias "RtlMoveMemory" (MyDest As Any, MySource As Any, ByVal MySize As Long) Private Declare Sub apiExitProcess Lib "Kernel32" Alias "ExitProcess" (ByVa...

General-purpose stopwatch for timing how long a function takes to run: object Benchmark { fun realtime(body: () -> Unit): Duration { val start = Instant.now() try { body() } finally { val end = Instant.now() return Duration.b...

If you are unsure which rules to list in your .gitattributes file, or you just want to add generally accepted attributes to your project, you can shoose or generate a .gitattributes file at: https://gitattributes.io/ https://github.com/alexkaratarakis/gitattributes

let imagePath = require("../../assets/list.png"); <Image style={{height: 50, width: 50}} source={imagePath} /> From external resource: <Image style={{height: 50, width: 50}} source={{uri: userData.image}} />

This following example is created by user Michael Dillon from this answer. Consider the following script: @set @junk=1 /* @echo off cscript //nologo //E:jscript %0 %* goto :eof */ //JScript aka Javascript here This script snippet does: Execute the cscript command which calls itsel...

As mentioned here, the old-school method to run another script is by using temporary files. Simple echo it into a file and then run it(and remove it optionally). Here's the basic concept: @echo off echo //A JS Comment > TempJS.js echo //Add your code>>TempJS.js cscript //nologo //e...

from flask_wtf import FlaskForm from wtforms import StringField, IntegerField from wtforms.validators import DataRequired class MyForm(FlaskForm): name = StringField('name', validators=[DataRequired()]) age = InterField('age', validators=[DataRequired()]) To render the template you...

You can save a canvas to an image file by using the method canvas.toDataURL(), that returns the data URI for the canvas' image data. The method can take two optional parameters canvas.toDataURL(type, encoderOptions): type is the image format (if omitted the default is image/png); encoderOptions is ...

A follow button is a button that links to a GitHub user page and prompts the user to follow the user. Here's how to create one: Go onto github:buttons Click "Follow" Place your GitHub username in the box labeled ":user" Customize the button using the boxes &quot...

The following command displays output only on the screen (stdout). $ ls The following command writes the output only to the file and not to the screen. $ ls > file The following command (with the help of tee command) writes the output both to the screen (stdout) and to the file. $ ls | ...