Variadic Functions Tutorial with Examples in Go. Variadic Function A variadic function is one that can be called with varying numbers of arguments. The most familiar examples are fmt.Printf and its variants. package main import "fmt" func add(v...

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, there are 2 ways to copy a file. Using io.Copy Function You can copy a file using the io.Copy() function. For example, package main import ( "io" "os" ) // Copy the src file to dst. func Copy(src, dst string) error { in, err...

In Python, using the uuid module is the easiest way to create a GUID/UUID. Using uuid Module uuid module provides immutable UUID objects (the UUID class) and the functions uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5 UUID...

In Python, using the triple-quoted strings is the easiest way to create multiline comments. Using triple-quoted Strings String literals can span multiple lines. One way is using triple-quotes: """...""" or '''...'''. You can use triple-quoted strin...

In Golang, using the os.O_APPEND flag is the easiest way to append text to a file Using os.OpenFile Function OpenFile is the generalized open call; most users will use Open or Create instead. It opens the named file with specified flag (O_RDONLY etc...

In Rust, there are 2 ways to index a string. Using as_bytes Function If the enum is C-like, then you can create a static array of each of the variants and return an iterator of references to them: fn main() { let s = "abc"; let b: u8 = s.as...

In Rust, there are 2 ways to iterate through the values of an enum. Using a static array If the enum is C-like, then you can create a static array of each of the variants and return an iterator of references to them: use self::Direction::*; use...

In Golang, using the os.MkdirAll function is the easiest way to create nested directories Using os.MkdirAll Function The os.MkdirAll() function creates a directory named path, along with any necessary parents, and returns nil, or else returns an er...

In Golang, using the io.copy function is the easiest way to download a large file Using io.Copy Function The io.Copy() function copies from src to dst until either EOF is reached on src or an error occurs. It returns the number of bytes copied and ...

In Rust, there are 2 ways to convert Vec to a string. Using collect Function The collect() function transforms an iterator into a collection. collect() can take anything iterable, and turn it into a relevant collection. This is one of the more powe...

In Rust, there are 3 ways to iterate over a string by character. Using chars Method The chars() method returns an iterator over the chars of a string slice. See the following example: fn main() { let s = "abc"; for c in s.chars() { pr...

In Golang, there are 4 ways to generate a uuid. Using uuid Package install Use the following command to download the repository to the local file system. install go mod tidy go get github.com/google/uuid go install github.com...

In Python, there are 3 ways to remove an element from a list by index. Using del Keyword There is a way to remove an item from a list given its index instead of its value. For example, #!/usr/bin/python3 # -*- coding: utf8 -*- l = [1, 2, 3, 4]...

In Python, there are 3 ways to merge two dictionaries into a new dictionary. Using Additional Unpacking Generalizations Starting with Python 3.5, we can merge in with literal notation as well. See the following example: #!/usr/bin/python3 # -*-...