Array

Loop an array and print items

C C++ C# Go Java JavaScript Perl PHP Python Ruby Shell

Loop an associative array and print items

C C++ C# Go Java JavaScript Perl PHP Python Ruby Shell

Get length of array

JavaScript Perl PHP Python Ruby

Get minimum value in the array

C C++ Java JavaScript Perl PHP Python Ruby Shell

Get maximum value in the array

C C++ Java JavaScript Perl PHP Python Ruby Shell

Join items in the array

JavaScript Perl PHP Python Ruby

Sort array in ascending order

C Java JavaScript Perl PHP Python Ruby

Sort array in descending order

C Java JavaScript Perl PHP Python Ruby

Sort associative array based on key in ascending order

JavaScript Perl PHP Python Ruby

Sort associative array based on key in descending order

JavaScript Perl PHP Python Ruby

Sort associative array based on value in ascending order

JavaScript Perl PHP Python Ruby

Sort associative array based on value in descending order

JavaScript Perl PHP Python Ruby


Class

Create class and object

C++ Go Java JavaScript Perl PHP Python Ruby

Create derived class and object

Java JavaScript Perl PHP Python Ruby


Database

Manipulate MySQL (Connect/Create Table/Insert/Select/Drop/Transaction)

JavaScript Perl PHP Python Ruby

Manipulate PostgreSQL (Connect/Create Table/Insert/Select/Drop/Transaction)

JavaScript Perl PHP Python Ruby

Manipulate SQLite (Connect/Create Table/Insert/Select/Drop/Transaction)

JavaScript Perl PHP Python Ruby


File systems

Check existence of file

JavaScript Perl PHP Python Ruby Shell

Write to file and read whole content of file at one time

JavaScript Perl PHP Python Ruby Shell

Write to file and read content of file line by line

JavaScript Perl PHP Python Ruby Shell

Check existence of directory

JavaScript Perl PHP Python Ruby Shell

Create and delete directories recursively

JavaScript Perl PHP Python Ruby Shell

Create, change permission and remove directory

JavaScript Perl PHP Python Ruby Rust Shell

Recursively find only files under certain directory

JavaScript Perl PHP Python Ruby


Network

Crawl and parse content of web site

JavaScript Perl PHP Python Ruby


Number

Align decimal places

JavaScript Perl PHP Python Ruby Shell


String

Print string (Hello World)

C C++ C# Go Java JavaScript Perl PHP Python Ruby Rust Shell

Trim white spaces of string at head and tail

C C++ C# Go Java JavaScript Perl PHP Python Ruby Rust Shell

Split string by separator

JavaScript Perl PHP Python Ruby

Make characters lower and replace specified character

JavaScript Perl PHP Python Ruby

Change upper characters into lower characters

C C++ Java JavaScript Perl PHP Python Ruby

Capitalize first character of all words

JavaScript Perl PHP Python Ruby Rust

Get length of string

JavaScript Perl PHP Python Ruby

Check whether the string contains the specified string by regex

JavaScript Perl PHP Python Ruby

Print all matched parts by regex

JavaScript Perl PHP Python Ruby

URL encode the string

JavaScript Perl PHP Python Ruby

URL decode the string

JavaScript Perl PHP Python Ruby

Convert string into hashed string using sha256

JavaScript Perl PHP Python Ruby Shell

Convert character encoding

JavaScript Perl PHP Python Ruby


System

Execute system command in program and get the result

JavaScript Perl PHP Python Ruby Shell


Test

Assert result

JavaScript Perl PHP Python Ruby Shell


Time

Get current date time in the format of YYYY/MM/DD hh:mm:ss

Go JavaScript Perl PHP Python Ruby Rust Shell

Get date of X days ago (example: 2 days ago)

Go JavaScript Perl PHP Python Ruby Rust Shell


Variable

Dump variable and check content

JavaScript Perl PHP Python Ruby

Check whether the variable is defined or not

JavaScript Perl PHP Python Ruby

Print passed parameters(ARGVs) through command line

C C++ C# Go Java JavaScript Perl PHP Python Ruby Rust Shell

Read Json file and parse it

JavaScript Perl PHP Python Ruby

Import environmental value from .env(dotenv) and print specified ENV value

JavaScript Perl PHP Python Ruby