DEV Community: Poopcoder

Remove unused npm modules from package.json

Poopcoder — Wed, 24 Feb 2021 15:50:55 +0000

Depcheck is a tool for analyzing the dependencies in a project to see: how each dependency is used, which dependencies are useless, and which dependencies are unused from package.json. To identify the unused package, just run npx depcheck in the project root directory.

> npx depcheck


npx: installed 146 in 88.761s
Unused dependencies
* express-validator

Next step is to uninstall the npm packages using npm uninstall command.

npm uninstall express-validator
npm WARN retina-backend@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.1.2 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

removed 2 packages and audited 626 packages in 12.337s

24 packages are looking for funding
  run `npm fund` for details

found 24150 vulnerabilities (24147 low, 3 high)
  run `npm audit fix` to fix them, or `npm audit` for details

The post Remove unused npm modules from package.json appeared first on Poopcode.

How to create copies of a string in JavaScript?

Poopcoder — Sat, 20 Feb 2021 12:56:38 +0000

To create copies of a string in JavaScript, we can use String.prototype.repeat() method. It takes a number as an argument and repeats the string n times and returns it.

let str = "poopcode";

console.log(str.repeat(2)); //poopcodepoopcode

console.log(str.repeat(5)); //poopcodepoopcodepoopcodepoopcodepoopcode

What are the possible ways to create objects in JavaScript?

Poopcoder — Thu, 18 Feb 2021 12:57:20 +0000

There are many ways to create objects in JavaScript as described below.

Object constructor

The simplest way to create an empty object is using the Object constructor. This approach is not recommended anymore.

var object = new Object();

Object’s create method

The create method of Object creates a new object by passing the prototype object as a parameter to the create() method.

var object = Object.create(null);

Object literal syntax

The object literal syntax is equivalent to create method when it passes null as parameter.

var object = {};

Function constructor

Create any function and apply the new operator to create object instances.

function Employee(name){
   var object = {};
   object.name=name;
   object.salary=1000;
   return object;
}
var object = new Person("John");

Object literal syntax

The object literal syntax is equivalent to create method when it passes null as parameter.

var object = {};

Function constructor + prototype

This is similar to function constructor but it uses prototype for their properties and methods.

function myObj(){};
myObj.prototype.name = "hello";
var k = new myObj();

ES6 class syntax

class myObject  {
  constructor(name) {
    this.name = name;
  }
}
var e = new myObject("hello");

Singleton pattern

A Singleton is an object which can only be instantiated one time. Repeated calls to its constructor return the same instance and this way one can ensure that they don’t accidentally create multiple instances.

var object = new function(){
   this.name = "Anand";
}

How to check if a list is empty in Python?

Poopcoder — Thu, 17 Dec 2020 11:55:38 +0000

In this tutorial we discuss the various ways of checking if a list is empty in Python.

len

lst = [1,2,3]

if len(lst) == 0:
    print 'List Empty'
else:
    print 'List not empty'

#List not empty

bool

lst = [1,2,3]

if not bool(list):
    print 'List Empty'
else:
    print 'List not empty'

#List not empty

equal

lst = [1,2,3]

if lst == []:
    print 'List Empty'
else:
    print 'List not empty'

#List not empty

The post How to check if a list is empty in Python? appeared first on Poopcode.

How to attach to an existing tmux session?

Poopcoder — Thu, 17 Dec 2020 04:45:15 +0000

To get the list of existing tmux session use tmux ls command.

> tmux ls
0: 1 windows (created Wed Dec 16 16:45:19 2020)

Here there is one session that already exists. To attach to this particular session ‘0’ we can use the following command.

> tmux attach-session -t 0

This will open the existing tmux session.

Convert a dictionary to a list of tuples in Python

Poopcoder — Wed, 16 Dec 2020 05:24:18 +0000

To convert a dictionary to a list of tuples you can pass the dictionary items into list constructor and it would return a list of tuples.

dictionary = {'name': 'Anand', 'age': 30, 'sex': 'Male'}
print(list(dictionary.items()))


#[('age', 30), ('name', 'Anand'), ('sex', 'Male')]