Understanding defer in Go. Deferred Function Calls A defer statement is an ordinary function or method call prefixed by the keyword defer. The function and argument expressions are evaluated when the statement is executed, but the actual call is def...

Working with Constants and iota in Go. The Constant Generator iota Here’s an example from the time package, which defines named constants of type Weekday for the days of the week, starting with zero for Sunday. Types of this kind are often called en...

Golang bytes.Buffer Examples Examples of Golang bytes.Buffer The bytes package provides the Buffer type for efficient manipulation of byte slices. A Buffer starts out empty but grows as data of types like string, byte, and []byte are written to it. ...

Calculate degrees celcius from farenheit in Go. Following program shows you how to convert fahrenheit to celsius. The function FToC below encapsu- lates the temperature conversion logic so that it is defined only once but may be used from multiple p...

An example program using numbers. Integers And Floating Point Numbers Go has several different types to represent numbers. Generally we split numbers into two different kinds: integers and floating-point numbers. Make a main.go file containing the ...

In Python, using the __file__ is the easiest way to get name of current script. Using Module Attributes You can use __file__ to get the name of the current file. When used in the main module, this is the name of the script that was originally invoke...

In Golang, using the Unmarshal JSON function is the easiest way to Marshal / Unmarshal json with a custom type attribute. JSON (JavaScript Object Notation) is a lightweight data-interchange format. Using UnmarshalJSON Function Example on custom Unm...

In Python, there are 2 ways to extract all the numbers contained in a string. Using List Comprehension List comprehensions provide a concise way to create lists. If you only want to extract only positive integers, try the following: #!/usr/bin/...

In Golang, using the crypto/aes package is the easiest way to encrypt a string using AES CBC. Ehrsam, Meyer, Smith and Tuchman invented the cipher block chaining (CBC) mode of operation in 1976. In CBC mode, each block of plaintext is XORed with the ...

In Golang, using the crypto/aes package is the easiest way to encrypt a string using AES GCM 256. In cryptography, Galois/Counter Mode (GCM) is a mode of operation for symmetric-key cryptographic block ciphers which is widely adopted for its performa...

In Golang, using the IsPrivate function is the easiest way to check if IP address is in private network space. Using IsPrivate Function The IsPrivate() function reports whether ip is a private address, according to RFC 1918 (IPv4 addresses) and RFC...

In PHP, using the $_SERVER variable is the easiest way to get the full URL. Using $_SERVER Variable $_SERVER is an array containing information such as headers, paths, and script locations. The following example should cover whatever you are trying...

In Python, there are 2 ways to find out the number of CPUs. Using multiprocessing Module The multiprocessing.cpu_count() method returns the number of CPUs in the system. For example, #!/usr/bin/python3 # Import module import multiprocessing c...

In Golang, there are 2 ways to escape the html. Using EscapeString Function The html.EscapeString() function escapes special characters like "

In Python, there are 3 ways to remove all empty strings from a list of strings. Using filter Function The filter(function, iterable) function constructs an iterator from those elements of iterable for which function returns true. The following exam...