Tutorial by Examples: re

Two of the most fundamental higher-order functions included in the standard library are map and filter. These functions are generic and can operate on any iterable. In particular, they are well-suited for computations on arrays. Suppose we have a dataset of schools. Each school teaches a particular...

A lot of example code posted on StackOverflow includes snippets like this: if ("A".equals(someString)) { // do something } This does "prevent" or "avoid" a possible NullPointerException in the case that someString is null. Furthermore, it is arguable that ...

A bit-field is used to club together many variables into one object, similar to a structure. This allows for reduced memory usage and is especially useful in an embedded environment. e.g. consider the following variables having the ranges as given below. a --> range 0 - 3 b --> range 0 -...

This class open a .gz file (usual format of compressed log files) and will return a line at each call of .NextLine() There is no memory usage for temporary decompression, very useful for large file. Imports System.IO Class logread_gz Private ptr As FileStream Private UnGZPtr As Compress...

Though Go supports ++ and -- operators and the behaviour is found to be almost similar to c/c++, variables with such operators cannot be passed as argument to function. package main import ( "fmt" ) func abcd(a int, b int) { fmt.Println(a," &...

You can attach an image in a texture to a framebuffer, so that you can render directly to that texture. glGenFramebuffers (1, &framebuffer); glBindFramebuffer (GL_FRAMEBUFFER, framebuffer); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, ...

You can read texture data with function glGetTexImage: char *outBuffer = malloc(buf_size); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture); glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, outBuffer); ...

preserveAspectRatio is an attribute that indicates whether the image should be scaled uniformly. This attribute only works if the <svg> element also has a viewBox. The default value is xMidYMid, which maintains the aspect ratio and centers the path inside the SVG container: <!-- when not ...

To set up a default SceneKit project you can use the Game Template.

If you are inserting data into a table with an auto increment column and if you want to get the value of the auto increment column. Say you have a table called my_table: CREATE TABLE my_table ( id serial NOT NULL, -- serial data type is auto incrementing four-byte integer name character varying...

When you try to restore database from another server you might get the following error: Error 3154: The backup set holds a backup of a database other than the existing database. In that case you should use WITH REPLACE option to replace database with the database from backup: RESTORE DATABAS...

The Same Database reference allows you to split a single database into multiple projects. This is useful for cases where a project is very large or where different teams manage different parts of the database. If you consider that you have two .sqlproj SSDT database projects with the following stru...

I have previously written documentation on this site in order to describe how to make web services on Symfony I will write again a tutorial for the symfony >= 3 version. We think that we have a installed web-server on a configured version of Symfony Framework. You must have composer (php packag...

REPL stands for 'Read Evaluate Print Loop.' The REPL can be used to write and execute code one line at a time and is an alternative to writing code to a file and then compiling or interpreting the entire file before execution. To start the SMLNJ REPL from a command prompt: smluser> sml Standar...

(************************************************* * All comments in SML are block comments * Block Comments begin with '(*' * Block Comments end with '*)' * (* Block Comments can be nested *) * The additional framing asterisks at the beginning * and end of this block comment are common ...

Operators that bound tighter (higher precedence) are listed first. OperatorsPrecedence group (≥3.0)PrecedenceAssociativity.∞left?, !, ++, --, [], (), {}(postfix)!, ~, +, -, ++, --(prefix)~> (swift ≤2.3)255left<<, >>BitwiseShiftPrecedence160none*, /, %, &, &*MultiplicationPrec...

program-one. FD important-file. 01 file-record. COPY record-layout. DATA DIVISION. 01 memory-record. COPY record-layout. PROCEDURE DIVISION. ... COPY record-move. ... COPY record-move. program-two. DATA DIVISION. 01 print-record. COPY record-lay...

(The following is a simplified version of what the Java Language Specification says. For a deeper understanding, you need to read the specification itself.) Happens-before relationships are the part of the Memory Model that allow us to understand and reason about memory visibility. As the JLS say...

This example will create an EC2 instance of t2.micro type in N.Virginia region running Amazon Linux. During the execution, it will ask to select the KeyPair to use and an I.P. CIDR from where you can SSH to the instance, use default to make SSH open to the internet { "AWSTemplateFormatVersion"...

You can create unlogged tables so that you can make the tables considerably faster. Unlogged table skips writing write-ahead log which means it's not crash-safe and unable to replicate. CREATE UNLOGGED TABLE person ( person_id BIGINT NOT NULL PRIMARY KEY, last_name VARCHAR(255) NOT NULL, ...