How to Marshal / Unmarshal Json with a Custom Type Attribute in Go
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...
How to Delete an Element from an Array in PHP
In PHP, there are 3 ways to delete an element from an array.
Using unset Function
The unset(mixed $var, mixed ...$vars): void function destroys the specified variables. For example,
$arr = ["a", "b", "d"];
unset($arr[1]);
print_r($arr);
Arr...
How to Set the Current Working Directory in Python
In Python, using the os.chdir method is the easiest way to set the current working directory
Using chdir Method
The os.chdir(path) method changes the current working directory to path. For example,
#!/usr/bin/python3
# Import module
import os
...
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 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 Get File Creation and Modification Dates Times in Python
In Python, there are 3 ways to get file creation and modification dates times.
Using os.path Function
The os.path.getmtime() function returns the time of last modification of path.
The os.path.getctime() function returns the system’s ctime which, o...
How to Randomly Select a Element from List in Python
In Python, there are 3 ways to randomly select a element from list.
Using random.choice Method
The random.choice() method returns a random element from the non-empty sequence seq. If seq is empty, raises IndexError. For example,
#!/usr/bin/pyth...
How To Install Go in Linux
In Golang, there are 2 ways to install Go in Linux.Download Packages
Download packages for Windows 64-bit, macOS, Linux, and more.
Go install
Linux
Remove any previous Go installation by deleting the /usr/local/go folder (if it exists), then extr...
Rust error: cannot assign twice to immutable variable
In Rust, variables by default are immutable.Variables Immutable
You can make them mutable by adding mut in front of the variable name. For example,
fn main() {
let x = 2;
println!("value x: {}", x);
x = 4;
println!("value x: {}", x);
}
...
How to calculate CRC32 checksum in Python
Python Examples of zlib.crc32Cyclic redundancy check
A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data.
Using zlib.crc32 Function
Computes a C...
How to fetch data from url in Python
Fetch Internet Resources Using The urllib Package.Fetching URLs
The simplest way to use urllib.request is as follows:
#!/usr/bin/env python3
# Import datetime module
import urllib.request
with urllib.request.urlopen('https://google.com') as respon...
How to use string constants in Python
String Constants Best Practice.String Constants in Python
The constants defined in this module are:
String constants:
string.ascii_lettersThe concatenation of the ascii_lowercase and ascii_uppercase constants described below. This value is not locale...
How to use the gzip command in Linux
Compress or uncompress FILEs.
Gzip reduces the size of the named files using Lempel-Ziv coding (LZ77). Whenever possible, each file is replaced by one with the extension .gz, while keeping the same ownership modes, access and modi‐ficati...
How to use the diff command in Linux
Compare FILES line by line.
You can use the diff command to show differences between two files, or each corresponding file in two directories. diff outputs differences between files line by line in any of several formats, selectable by command line o...
How to use the curl command in Linux
command line tool and library for transferring data with URLs.
cURL (pronounced 'curl') is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various network protocols. The name ...