How to Fetch Return Value from a goroutine in Golang
Catching return values from goroutines in Go.
Channels
A channel is a communication mechanism that lets one goroutine send values to another goroutine.
Make a main.go file containing the following:
package main
import (
"fmt"
"time"
)
func ...
How to Use Variadic Functions in Golang
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...
How to Add Two Numbers in Go
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 ...
How to Make a Shallow Copy of a Slice in Go
In Golang, there are 2 ways to duplicate slices.
Using append Function
You could write one simple statement to make a shallow copy of a slice.
The following example should cover whatever you are trying to do:
package main
import "fmt"
type T...
How to Extract All the Numbers Contained in a String in Python
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/...
How to Encrypt and Decrypt a String Using AES CBC in Go
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 ...
How to Generate a SHA256 HMAC Hash from a String in Go
In Golang, using the crypto/hmac library is the easiest way to generate a SHA256 HMAC Hash from a string.
In cryptography, an HMAC (hash-based message authentication code) is a specific type of message authentication code (MAC) involving a cryptograp...
How to Get the Full URL in PHP
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...
How to Change the Current Directory in Go
In Golang, there are 2 ways to change the current directory.
Using Dir Property
Usually if you need a command to run from a specific directory, you can specify that as the Dir property on the Command, for example:
package main
import (
"os/...
How to Check if a File is a Valid Image in Go
In Golang, there are 2 ways to check if a file is a valid image.
Using DetectContentType Function
The http.DetectContentType() function implements the algorithm described at https://mimesniff.spec.whatwg.org/ to determine the Content-Type of the gi...
How to Clear a bytes.Buffer in Go
In Golang, using the buffer.Reset function is the easiest way to clear a bytes.Buffer
Using buffer.Reset Function
The buffer.Reset() function resets the buffer to be empty, but it retains the underlying storage for use by future writes. Reset is the...
How to Concatenate a List of Strings into a Single String in Python
In Python, using the str.join function is the easiest way to concatenate a list of strings into a single string
Using str.join Function
The str.join() method returns a string which is the concatenation of the strings in iterable. A TypeError will be...
How to Remove an Element from a Vector in Rust
In Rust, there are 2 ways to remove an element from a vector.
Using retain Function
The vec::retain() function retains only the elements specified by the predicate.
For example,
fn main() {
let mut v = vec![1, 3, 2, 3, 4];
v.retain(|&x| x ...
How to Find Out the Number of CPU's on a Local Machine in Go
In Golang, using the NumCPU function is the easiest way to find out the number of CPU's on a local machine.
Using runtime.NumCPU Function
The runtime.NumCPU() method returns the number of logical CPUs usable by the current process.
The set of avail...
How to Make First Letter of Words Uppercase in a String in Go
In Golang, using the cases package is the easiest way to make first letter of words uppercase in a string.
Using cases Package
install
Use the following command to download the repository to the local file system.
install
go mod tidy
...