Newbe Dev Stack

Example 1: Difference between Array vs ArrayList Arrays are fixed size ArrayList's size auotomatically adjusted Arrays can hold primitives and object ArrayList can hold only objects Arrays can be multi dimensional ArrayList cannot be multi-dimentional Array is a build in data structure ArrayList is implementing class of List interface in Collection framework Example 2: arraylist vs vector in java ArrayList is not thread safe Vector is thread safe/syncronized ArrayList is faster than Vector Both allow duplicate values and keep ordering Both are implementations of List interface

Example: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' This error happened because the image didn't load properly. So you have problem with the previous line cv2.imread my suggestion is : check if the images exist in the path you give check the count variable if he have valid number

Answer : One can solve the problem by usage of dotnet ef dbcontext scaffold command with multiple -t ( --table ) parameters. It allows to specify all the tables, which needed by imported (scaffolded). The feature is described initially here. It is possible to specify the exact tables in a schema to use when scaffolding database and to omit the rest. The command-line examples that follow show the parameters needed for filtering tables. .NET Core CLI: dotnet ef dbcontext scaffold "server=localhost;port=3306;user=root;password=mypass;database=sakila" MySql.Data.EntityFrameworkCore -o sakila -t actor -t film -t film_actor -t language -f Package Manager Console in Visual Studio: Scaffold-DbContext "server=localhost;port=3306;user=root;password=mypass;database=sakila" MySql.Data.EntityFrameworkCore -OutputDir Sakila -Tables actor,film,film_actor,language -f Force tag will update the existing selected models/files i...

Answer : Commit and push using this syntax: git commit -m "Sort more efficiently" -m "Closes #843" git push This will commit and close the issue. Note that unlike Github a single -m will not work. The following will appear on the issue page: References: https://docs.gitlab.com/ee/user/project/issues/automatic_issue_closing.html How to commit a change with both "message" and "description" from the command line? According to this link from gitlab, you will be able to do that with a variety of words such as "fixes" or "closes". It does not need to be in a seperate line. So you could have the following message: Fixes #20. I had to replace "foo" with "bar". And that will close issue #20.

Example 1: cdn ckeditor < script src = " https://cdn.ckeditor.com/4.14.0/standard/ckeditor.js " > </ script > Example 2: ckeditor cdn < script src = " https://cdn.ckeditor.com/ckeditor5/23.1.0/classic/ckeditor.js " > </ script >

Example: latex space between paragraphs and lines \setlength { \parindent } { 4 em } \setlength { \parskip } { 1 em } \renewcommand { \baselinestretch } { 1.5 }

Example: alphabet binary code Alphabet table Letter ASCII Code Binary Letter ASCII Code Binary a 097 0110 0001 A 065 0100 0001 b 098 0110 0010 B 066 0100 0010 c 099 0110 0011 C 067 0100 0011 d 100 0110 0100 D 068 0100 0100 e 101 0110 0101 E 069 0100 0101 f 102 0110 0110 F 070 0100 0110 g 103 0110 0111 G 071 0100 0111 h 104 0110 1000 H 072 0100 1000 i 105 0110 1001 I 073 0100 1001 j 106 0110 1010 J 074 0100 1010 k 107 0110 1011 K 075 0100 1011 l 108 0110 1100 L 076 0100 1100 m 109 0110 1101 M 077 0100 1101 n 110 0110 1110 N 078 0100 1110 o 111 0110 1111 O 079 0100 1111 p 112 0111 0000 P 080 0101 0000 q 113 0111 0001 Q 081 0101 0001 r 114 ...

Example 1: install node js ubuntu sudo apt - get install curl curl - sL https : //deb.nodesource.com/setup_13.x | sudo -E bash - sudo apt - get install nodejs # Check node version node - v # v 13.9 .0 # Also , check the npm version npm - v # 6.13 .7 Example 2: install nvm ubuntu curl - o - https : //raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash export NVM_DIR = "$([ -z " $ { XDG_CONFIG_HOME - } " ] && printf %s " $ { HOME } / . nvm " || printf %s " $ { XDG_CONFIG_HOME } / nvm ")" [ - s "$NVM_DIR/nvm.sh" ] && \ . "$NVM_DIR/nvm.sh" # This loads nvm . Now you can use nvm Example 3: ubuntu 18 install nodejs cd ~ curl - sL https : //deb.nodesource.com/setup_12.x -o nodesource_setup.sh sudo bash nodesource_setup . sh sudo apt install nodejs nodejs - v # shows your version

Example: ryzen 5 vs intel i5 10th gen AMD won by 1 point overall they all are dope

Example 1: how to change a string to an float in c++ # include <iostream> # include <string> int main ( ) { std :: string str = "123.4567" ; // convert string to float float num_float = std :: stof ( str ) ; // convert string to double double num_double = std :: stod ( str ) ; std :: cout << "num_float = " << num_float << std :: endl ; std :: cout << "num_double = " << num_double << std :: endl ; return 0 ; } Example 2: c++ std string to float std :: string num = "0.6" ; double temp = :: atof ( num . c_str ( ) ) ; std :: cout << temp << std :: endl ; // Output: 0.6

Answer : You have 2 options when dealing with assets. The reason you do not see your assets physically in your computer is because you chose Option 1. Option 1: SYMFONY CAN PROCESS THE FILES DYNAMICALLY FOR YOU That means that each asset path generated in the dev environment is handled dynamically by Symfony. Therefore, Assetic generates paths to CSS and JavaScript files that don't physically exist on your computer. This is an internal Symfony controller that opens the files and serves back the content for you. Advantages: - Changes made on your assets take immediate effect - This is great in dev mode as Symfony generates the files dynamically for you Disadvantages: - This is not possible in prod mode as rendering each asset dynamically would be too slow - The assets won't be directly accessible on your computer (which is why you cannot find the file) - Can be quite slow if you are using a lot of filters, etc... To do this in dev mode, ju...

Example: how-to-increase-maximum-upload-file-size-in-wordpress 1. Update . htaccess file php_value upload_max_filesize 128 M php_value post_max_size 128 M php_value memory_limit 256 M php_value max_execution_time 300 php_value max_input_time 300 Change the numbers to the values that you need . The max execution time and max input time values are in seconds and might need to be increased further if your internet connection is slow . 2. Update wp - config . php file @ ini_set ( 'upload_max_filesize' , '128M' ) ; @ ini_set ( 'post_max_size' , '128M' ) ; @ ini_set ( 'memory_limit' , '256M' ) ; @ ini_set ( 'max_execution_time' , '300' ) ; @ ini_set ( 'max_input_time' , '300' ) ; reference : https : //help.servmask.com/2018/10/27/how-to-increase-maximum-upload-file-size-in-wordpress/

Answer : If you're using the Stripe PHP libraries and they have been namespaced (such as when they're installed via Composer) you can catch all Stripe exceptions with: <?php try { // Use a Stripe PHP library method that may throw an exception.... \Stripe\Customer::create($args); } catch (\Stripe\Error\Base $e) { // Code to do something with the $e exception object when an error occurs echo($e->getMessage()); } catch (Exception $e) { // Catch any other non-Stripe exceptions } I think there is more than these exceptions ( Stripe_InvalidRequestError and Stripe_Error ) to catch. The code below is from Stripe's web site. Probably, these additional exceptions, which you didn't consider, occurs and your code fails sometimes . try { // Use Stripe's bindings... } catch(Stripe_CardError $e) { // Since it's a decline, Stripe_CardError will be caught $body = $e->getJsonBody(); $err = $body['error']; print('Status is:...

Answer : git log takes (among other things): -n num to limit the number of commits shown: choose 1 (and if num is 9 or less you can just write - num , hence, -1 , for short) --pretty=format: string with directives to change the log output format. The %s directive gets the commit "subject", which is what you also get with oneline . Hence: git log -n 1 --pretty=format:%s $hash (or git log -1 --pretty=format:%s ) will do the trick here. For a complete list of format directives, see the git log documentation, under "PRETTY FORMATS" (about halfway down). Depending on how much of the commit message you actually want, there are several pretty-format specifiers that you can use: · %s: subject · %f: sanitized subject line, suitable for a filename · %b: body · %B: raw body (unwrapped subject and body) So something like git log -1 --pretty=format:%b <hash> , or use one of the other specifiers (I think %s is probably cl...

Example 1: macos clear terminal clear && printf '\e[3J' Example 2: clear terminal mac Clear terminal on macOS: Command + K (alternatively type: clear)

Example 1: js classlist classList . item ( index ) ; // Returns the item in the list by its index, or undefined if index is greater than or equal to the list's length classList . contains ( token ) ; // Returns true if the list contains the given token, otherwise false. classList . add ( token1 [ , ... tokenN ] ) ; // Adds the specified token(s) to the list. classList . remove ( token1 [ , ... tokenN ] ) ; // Removes the specified token(s) from the list. classList . replace ( oldToken , newToken ) ; // Replaces token with newToken. classList . supports ( token ) ; // Returns true if a given token is in the associated attribute's supported tokens. classList . toggle ( token [ , force ] ) ; // Removes token from the list if it exists, or adds token to the list if it doesn't. Returns a boolean indicating whether token is in the list after the operation. classList . entries ( ) ; // Returns an iterator, allowing you to go through all key/value pairs conta...

Answer : The conductivity of the vacuum is not a very trivial issue. In fact, depending on how you look at it, it behaves in two different ways. Firstly, there is no retarding force on any charged particle with constant velocity in vacuum. To this extent, no extra work is required in maintaining a constant current through any surface in vacuum. In stark contrast however, is the presence of free charges in conductors. Normally, when an electric field E \mathbf{E} E is applied across a conductor, we get a current density due to the 'internal' charge flow, given by: J = σ E \mathbf{J} = \sigma\mathbf{E} J = σ E where σ \sigma σ is the conductivity. Clearly, σ = 0 \sigma = 0 σ = 0 in a vacuum - electric fields do not spontaneously cause currents to flow. Thus, in this sense, the vacuum is not a conductor at all. Even everyday insulators have low but non-zero values of σ \sigma σ . Thus, the resistance of the vacuum is in fact, infinite, as long as we define resistance ...

Example 1: c substring //where we want the word "test" and we know its position in the string char * buff = "this is a test string" ; printf ( "%.*s" , 4 , buff + 10 ) ; Example 2: c substring char subbuff [ 5 ] ; memcpy ( subbuff , & buff [ 10 ] , 4 ) ; subbuff [ 4 ] = '\0' ;

Answer : .full-width { width: 100vw; position: relative; margin-left: -50vw; left: 50%; } <div class="container"> <div class="container-fluid full-width"> </div> </div> This works because you are using vw - vertical-width which equals enduser's desktop width. This overrides % because a % is the percentage of a parent, vh uses the desktop. You cannot use .container-fluid inside of a .container and get what you're trying to achieve. Look at the code for Bootstrap's .container class; it has a fixed width. You need to use .container-fluid OUTSIDE of the fixed-width container. An example is below: <div class="container"> <div class="row"> <div class="col-md-12"> <p>Some Content</p> </div> </div> </div> <div class="container-fluid"> <div class="row...