Dev Stack Source

Example 1: firebase cloud method update firebase deploy -- only functions : functionNameHere Example 2: document.set() firebasefirestore java var washingtonRef = db . collection ( "cities" ) . doc ( "DC" ) ; // Atomically add a new region to the "regions" array field.washingtonRef.update({ regions: firebase.firestore.FieldValue.arrayUnion("greater_virginia")});// Atomically remove a region from the "regions" array field.washingtonRef.update({ regions: firebase.firestore.FieldValue.arrayRemove("east_coast")});

Example 1: char to int c++ int x = (int)character - 48; Example 2: integer to char c++ // for example you have such integer int i = 3; // and you want to convert it to a char so that char c = '3'; what you need to do is, by adding i to '0'. The reason why it works is because '0' actually means an integer value of 48. '1'..'9' means 49..57. This is a simple addition to find out corresponding character for an single decimal digit integer: i.e. char c = '0' + i; If you know how to convert a single decimal digit int to char, whats left is how you can extract individual digit from a more-than-one-decimal-digit integer it is simply a simple math by making use of / and % int i = 123 % 10; // give u last digit, which is 3 int j = 123 / 10; // give remove the last digit, which is 12 The logic left is the homework you need to do then. Example 3: C++ int to char* std::string s = std::to_string(number); char const *pchar = s.c_str();

Answer : If you want to convert hex to rgb you can use sscanf: <?php $hex = "#ff9900"; list($r, $g, $b) = sscanf($hex, "#%02x%02x%02x"); echo "$hex -> $r $g $b"; ?> Output: #ff9900 -> 255 153 0 Check out PHP's hexdec() and dechex() functions: http://php.net/manual/en/function.hexdec.php Example: $value = hexdec('ff'); // $value = 255 I made a function which also returns alpha if alpha is provided as a second parameter the code is below. The function function hexToRgb($hex, $alpha = false) { $hex = str_replace('#', '', $hex); $length = strlen($hex); $rgb['r'] = hexdec($length == 6 ? substr($hex, 0, 2) : ($length == 3 ? str_repeat(substr($hex, 0, 1), 2) : 0)); $rgb['g'] = hexdec($length == 6 ? substr($hex, 2, 2) : ($length == 3 ? str_repeat(substr($hex, 1, 1), 2) : 0)); $rgb['b'] = hexdec($length == 6 ? substr($hex, 4, 2) : ($length == 3 ? str_repeat(substr($hex, 2, 1)

Example 1: how to query in firestore db .collection ( "cities" ) .where ( "capital" , "==" , true ) .get ( ) .then ( function ( querySnapshot ) { querySnapshot .forEach ( function ( doc ) { // doc. data ( ) is never undefined for query doc snapshots console. log ( doc.id , " => " , doc. data ( ) ) ; } ) ; } ) .catch ( function ( error ) { console. log ( "Error getting documents: " , error ) ; } ) ; Example 2: multiple query at once in firebase function doSomething ( ... ) { let result1 = [] ; let result2 = [] ; admin .firestore ( ) .collection ( '...' ) .where ( 'some condition' ) .get ( ) .then ( ( results: any ) = > { results .forEach ( ( element: any ) = > { if ( some other condition ) { result1. push ( element ) ; } } ) .catch ( ( error: any ) = > { //log

Answer : Solution 1: If {{ user }} already exists in the system, you should use the following to just add it to a group: - name: adding existing user '{{ user }}' to group sudo user: name: '{{ user }}' groups: sudo append: yes To add it to a set of groups, you can use a comma separated list, for example groups: admin,sudo . Just beware that if you omit append: yes , your user will be removed from all other groups, according to the usermod man page. That would useful if you want to use a specific list of groups a user should belong to. Solution 2: According to the User module you can use this: - name: Adding user {{ user }} user: name={{ user }} group={{ user }} shell=/bin/bash password=${password} groups=sudo append=yes You can just add the groups=groupname and append=yes to add them to an existing user when you're creating them Solution 3: Please note that {{ user }} was changed to {{

Example 1: drop shadow image css filter : drop-shadow ( 0 px 10 px 3 px black ) ; Example 2: shadow css Source :www .w3schools .com 0 image shadow cssCSS By Ankur on May 1 2020 Donate <!Doctype > <html > <head > <style > .img { width : 400 px ; height : 200 px ; border : 2 px solid #fff ; background : url ( img/tiger.png ) no-repeat ; box-shadow : 10 px 10 px 5 px #ccc ; -moz-box-shadow : 10 px 10 px 5 px #ccc ; -webkit-box-shadow : 10 px 10 px 5 px #ccc ; -khtml-box-shadow : 10 px 10 px 5 px #ccc ; } </style> </head> <body> <div class= "img" ></div> </body> </html> Example 3: add shadow to background image css box-shadow : inset 0 0 5 px 2 px #282a2d ; /* mark the inset */

Example: Conversion failed when converting the varchar value to data type int. CONVERT(INT, CASE WHEN IsNumeric(CONVERT(VARCHAR(12), a.value)) = 1 THEN CONVERT(VARCHAR(12),a.value) ELSE 0 END)

Answer : The easiest would be to install chrome-driver via anaconda (especially when running on a machine where you don't have permissions to install chrome-driver from .deb package) conda install -c conda-forge python-chromedriver-binary (updated based on comment from bgoodr (https://stackoverflow.com/users/257924/bgoodr) - please vote his comment below ). The simplest solution is to install chromedriver as suggested by @bgodr: conda install -c conda-forge python-chromedriver-binary Then at the top of your code, add the following import statement to update your PATH variable appropriately: import chromedriver_binary Download latest chromedriver Update Chrome itself In your code from selenium import webdriver driver_path = '/path to chromedriver.exe/' driver = webdriver.Chrome(driver_path) driver.get('somewebsite')

Example: center image latex \begin { center } \includegraphics { yourimage } \end { center }

Example 1: csgo mouse wheel jump bind bind mwheelup +jump;bind mwheeldown +jump;bind space +jump Example 2: bind mousewheel jump csgo bind "mwheelup" "+jump"; bind "mwheeldown" "+jump";

Example 1: c++ online compiler This two are good C ++ compilers : https : //www.onlinegdb.com/online_c++_compiler https : //www.programiz.com/cpp-programming/online-compiler/ Example 2: cpp online compiler Best Site With auto compile : https : //godbolt.org/z/nEo4j7

Example: firebase user profile flutter class StartUpViewModel extends BaseModel {}

Example 1: python strip characters # Python3 program to demonstrate the use of # strip ( ) method string = " python strip method test " # prints the string without stripping print ( string ) # prints the string by removing leading and trailing whitespaces print ( string . strip ( ) ) # prints the string by removing strip print ( string . strip ( ' strip' ) ) Output : python strip method test python strip method test python method test Example 2: strip in python txt = " banana " x = txt . strip ( ) # x will be "banana" Example 3: python strip txt = " test " txt . strip ( ) # Output : "test" txt . lstrip ( ) # Output : "test " txt . rstrip ( ) # Output : " test" Example 4: python strip # removes outside whitespace / characters ' hey ' . strip ( ) # "hey" ' hey ' . lstrip ( ) # "

Example 1: python calculate factorial def factorial ( n ) : fact = 1 for num in range ( 2 , n + 1 ) : fact = fact * num return ( fact ) Example 2: factorial in python def factorial ( n ) : if n == 0 : return 1 else : return n * factorial ( n-1 ) n= int ( input ( "Input a number to compute the factiorial : " ) ) print ( factorial ( n ) ) Example 3: Find faculty of a number python #Assumes n is possitive def factorial ( n ) : return 1 if n <= 1 else n* factorial ( n-1 ) Example 4: algorithm for factorial in python def factorial ( n ) : for x in range ( n-1 , 0 , -1 ) : n = n*x if n == 0 : return 1 if n < 0 : return False return n factorial ( 5 ) # returns 120 ####### lambda Factorial ######## factorial = lambda n : n* factorial ( n-1 ) if n > 0 else 1 #OR factorial = lambda n : n> 0 and n* factorial ( n-1 ) or 1 ######### Recursion ########## def factorial ( n ) : if n <= 0 : return 1

Example 1: css flex /* Flex */ .anyclass { display : flex ; } /* row is the Default, if you want to change choose */ .anyclass { display : flex ; flex-direction : row | row-reverse | column | column-reverse ; } .anyclass { /* Alignment along the main axis */ justify-content : flex-start | flex-end | center | space-between | space-around | space-evenly | start | end | left | right ... + safe | unsafe ; } Example 2: flex box in css <!--basic--flex--layout-- > <html > <head > <style > .parent { display : flex or inline-flex ; flex-direction : row or column ; flex-wrap : wrap or wrap-reverse ; } </style> </head> <body> <div class= "parent" > <div class= "child-1" ></div> . . . </div> </body> </html>

Answer : Change it to GL_LUMINANCE. See https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glTexImage2D.xhtml in the FragmentShader, you can write: uniform sampler2D A; vec3 result = vec3(texture(A, TexCoord).r); in the cpp file,you can write: glTexImage2D( GL_TEXTURE_2D, 0, GL_RED, dicomImage->GetColumns(), dicomImage->GetRows(), 0, GL_RED, GL_UNSIGNED_BYTE, pixelArrayPtr);

Example 1: exit game unity //Quit/Stop Game Application . Quit ( ) ; Example 2: unity exit script //C# public static class AppHelper { # if UNITY_WEBPLAYER public static string webplayerQuitURL = "http://google.com" ; # endif public static void Quit ( ) { # if UNITY_EDITOR UnityEditor . EditorApplication . isPlaying = false ; # elif UNITY_WEBPLAYER Application . OpenURL ( webplayerQuitURL ) ; # else Application . Quit ( ) ; # endif } }