Tutorial by Examples: in

Dependency installation ( https://www.npmjs.com/package/gulp-imagemin ) $ npm install --save-dev gulp-imagemin Usage /* * Your other dependencies. */ var imagemin = require('gulp-imagemin'); /* * `gulp images` - Run lossless compression on all the images. */ gulp.task('images', f...

You can create a custom exception and throw them during the execution of your function. As a general practice you should only throw an exception when your function could not achieve its defined functionality. Private Function OpenDatabase(Byval Server as String, Byval User as String, Byval Pwd as S...

#lang racket (for ([path (in-directory)] #:when (regexp-match? #rx"[.]rkt$" path)) (printf "source file: ~a\n" path)) The #lang line specifies the programming language of this file. #lang racket we are using the baseline, battery-included Racket programming language. O...

You can import a single package with the statement: import "path/to/package" or group multiple imports together: import ( "path/to/package1" "path/to/package2" ) This will look in the corresponding import paths inside of the $GOPATH for .go files and ...

Generics was introduced in Java in its version (1.)5. These are erased during compilation, so runtime reflection is not possible for them. Generics generate new types parametrized by other types. For example we do not have to create new classes in order to use type safe collection of Strings and Num...

Say you have a table named table or you want to create a table with name which is also a keyword, You have to include the name table in pair of double quotes "table" Select * from table; Above query will fail with syntax error, where as below query will run fine. Select * from "tab...

The Z80 has no Interrupt table like modern processors. The Interrupts all execute the same code. In Interrupt Mode 1, they execute the code in a specific unchangeable location. In Interrupt Mode 2, they execute the code from the Pointer register I points to. The Z80 has got a timer, that triggers t...

Run repair on a particular partition range. nodetool repair -pr Run repair on the whole cluster. nodetool repair Run repair in parallel mode. nodetool repair -par

Sometimes it's really useful to know the type of child component when iterating through them. In order to iterate through the children components you can use React Children.map util function: React.Children.map(this.props.children, (child) => { if (child.type === MyComponentType) { ......

Assuming you know the productID: First import StoreKit Then in your code let productID: Set = ["premium"] let request = SKProductsRequest(productIdentifiers: productID) request.delegate = self request.start() and in the SKProductsRequestDelegate: func productsRequest(request: ...

package com.mcf7.spring.domain; import org.springframework.validation.Errors; import org.springframework.validation.Validator; public class BeforeCreateBookValidator implements Validator{ public boolean supports(Class<?> clazz) { return Book.class.equals(clazz); } ...

package com.mcf7.spring.domain; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.CommandLineRunner; import org.springframework.stereotype.Component; @Component public class DatabaseLoader implements CommandLineRunner { private final BookRep...

package com.mcf7.spring.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.data.rest.core.event.ValidatingRepositoryEventListener; import org...

int get_l2cap_connection () { First off, all the variables we need, explanation for will follow at the appropriate spot. int ssock = 0; int csock = 0; int reuse_addr = 1; struct sockaddr_l2 src_addr; struct bt_security bt_sec; int result = 0; First, we need to cre...

Usually, J and K move up and down file lines. But when you have wrapping on, you may want them to move up and down the displayed lines instead. set wrap " if you haven't already set it nmap j gj nmap k gk

set mouse=a This will enable mouse interaction in the vim editor. The mouse can change the current cursor's position select text

PHP Classes are powerful tool for improving code organization and minimizing naming collisions. At some point or another, the question of how to create an action hook for a class method inevitably arises. The $function_to_add argument is often shown as a string containing the function's name, howev...

Python Code import numpy as np import cv2 #loading haarcascade classifiers for face and eye #You can find these cascade classifiers here #https://github.com/opencv/opencv/tree/master/data/haarcascades #or where you download opencv inside data/haarcascades face_cascade = cv2.CascadeClassi...

With Ruby you can modify the structure of the program in execution time. One way to do it, is by defining methods dynamically using the method method_missing. Let's say that we want to be able to test if a number is greater than other number with the syntax 777.is_greater_than_123?. # open Numeric...

Monkey patching's main issue is that it pollutes the global scope. Your code working is at the mercy of all the modules you use not stepping on each others toes. The Ruby solution to this is refinements, which are basically monkey patches in a limited scope. module Patches refine Fixnum do ...