Tutorial by Topics: o

index(big, little) length or length() length(string) match(string, regex) split(string, array, separator) split(string, array) sprintf(format, ...) sub(regex, subst, string) sub(regex, subst) gsub(regex, subst) gsub(regex, subst, string) substr(string, start, end) substr(string, start)...

A route is like mapping a URL to an action (function) in a Controller class. The following topic will focus on creating routes, passing parameters to the Controller class via a route either using YAML or annotation. It's useful to see what is generated by Symfony framework, this one provide to...

A browser's debugging console or web console is generally used by developers to identify errors, understand flow of execution, log data and for many other purpose at runtime. This information is accessed through the console object. void console.log(obj1 [, obj2, ..., objN]); void console.log(...

pyinstaller [options] script [script ...] | specfile PyInstaller is a module used to bundle python apps in a single package along with all the dependencies. The user can then run the package app without a python interpreter or any modules. It correctly bundles many major packages like numpy...

Backing up the filesystem instead of using pg_dumpall and pg_dump It's very important that if you use this, you call the pg_start_backup() function before and pg_stop_backup() function after. Doing filesystem backups is not safe otherwise; even a ZFS or FreeBSD snapshot of the filesystem backed u...

class Some[+T](value: T) extends Option[T] object None extends Option[Nothing] Option[T](value: T) Constructor to create either a Some(value) or None as appropriate for the value provided.

groovy.util.Node = node.find { childNode -> return true || false } node.append(nodeYouWantAsAChild) groovy.util.Node parsedNode = (new XmlParser()).parseText(someRawXMLString) ''' mutli-line string (not interpolated) ''' The three basic files of an IntelliJ project - the ipr, iws, and...

Model–view–controller (MVC) is an architectural pattern in software design, not a design pattern, which describes a way to structure our application and the responsibilities and interactions for each part in that structure. [1] Historically, MVC was first described in 1979 by Trygve Reenskaug as ...

This document describes the basic behaviour of an operator.

javap [options] <classes> NameDescription<classes>List of classes to disassemble. Can be in either package1.package2.Classname format, or package1/package2/Classname format. Do not include the .class extension.-help, --help, -?Print this usage message-versionVersion information-v...

The ' symbol used in the macroexpand example is just syntactic sugar for the quote operator. You could have written (macroexpand (quote (infix 1 + 2))) instead. Macros are just functions that run at compile time, i.e. during the eval step in a read-eval-print-loop. Reader macros are anothe...