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Dockerfiles are files used to programatically build Docker images. They allow you to quickly and reproducibly create a Docker image, and so are useful for collaborating. Dockerfiles contain instructions for building a Docker image. Each instruction is written on one row, and is given in the form &l...

#include <math.h> double pow(double x, double y); float powf(float x, float y); long double powl(long double x, long double y); To link with math library use -lm with gcc flags. A portable program that needs to check for an error from a mathematical function should set errno ...

How to exract tar.gz/bz2/tbz files : If Your File Extension is .tar.gz (or .tgz) use this command tar xvzf file.tar.gz x: This tells tar to extract the files. v: This option will list all of the files one by one in the archive. The “v” stands for “verbose.” z: The z option is ...

YAML is a recursive acronym for "YAML Ain't Markup Language". It is a human readable data serialization standard for all programming languages. VersionRelease Date1.02004-01-291.12005-01-181.22009-10-01

Functional programming is a programming paradigm which models computations (and thus programs) as the evaluation of mathematical functions. It has its roots in lambda calculus, which was developed by Alonzo Church in his research on computability. Functional programming has some interesting conce...

What is the intent ? Adopt the principle of separation of concerns. Create a separation between the subject and the observer. Allow multiple observers to react to change a single subject. What is the structure ? Subject provides a way to Register, Unregister, Notify. Observer provid...

The Unicode Standard is an international standardized character set. It attempts to assign characters and symbols from every writing system a unique number. With every major new version, additional characters are added to the Standard to achieve this goal. In providing a unified character set for ...

Lisp is often used in educational contexts, where students learn to understand and implement recursive algorithms. Production code written in Common Lisp or portable code has several issues with recursion: They do not make use of implementation-specific features like tail call optimization, ofte...

GCC (upper case) refers to the GNU Compiler Collection. This is an open source compiler suite which include compilers for C, C++, Objective C, Fortran, Ada, Go and Java. gcc (lower case) is the C compiler in the GNU Compiler Collection. Historically GCC and gcc have been used interchangeably, b...

alert( message ) confirm( message ) prompt( message [, optionalValue]) print() https://www.w3.org/TR/html5/webappapis.html#user-prompts https://dev.w3.org/html5/spec-preview/user-prompts.html