thiscodeWorks - Saving, organizing & sharing the best of code online

How to Save HTML Form Data in JSON - Express

<form action="/new" method="post">
 
  <input name="title" type="text">
  <input name="description" type="text">
  <button type="submit">Submit Form</button>
 
</form>

> More steps

#javascript

Get URL and URL Parts in JavaScript

@FlowerFine

var newURL = window.location.protocol + "//" + window.location.host + "/" + window.location.pathname + window.location.search

f5

@buildadev

function greet(name)
{
    console.log("Hello "+name);
};

res = greet("john");
console.log(res);

#historicalcode #numbers

The Vancouver Stock Exchange’s Rounding Error that Dropped the Market Value by Half

@chrissyjones

- return floor(value)
+ return round(value)

#javascript #nodejs #commandline

HTTPS Redirect in Nodejs

@mishka

npm install heroku-ssl-redirect

> More steps

#javascript #nodejs

Append a Value to an Array

db.students.update(
   { _id: 1 },
   { $push: { scores: 89 } }
)

#javascript

Full Stack Developer

@rajesh

function full_stack_developer() {
    full_stack_developer();
}

Detecting combination keypresses (Control, Alt, + Keyboard Letter)

@sid

document.addEventListener %28"keydown", function (zEvent%29 {
    if (zEvent.ctrlKey  &&  zEvent.altKey  &&  zEvent.key === "e") {  // case sensitive
        // DO YOUR STUFF HERE
    }
} );

#html #javascript #jsfunctions #dom #dommanipulation

getAttribute() - how to get the value of any attribute of HTML element

@_right_away_

<html>

<input id="contact" name="address">

<script>

    var x = document.getElementById("contact").getAttribute('name');

</script>

</html>

#ios #swift #howto #appdevelopment #apps

Alert Controller for Swift 5 in Xcode

@0musicon0

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>IDECodeSnippetCompletionPrefix</key>
	<string>snippetAlert</string>
	<key>IDECodeSnippetCompletionScopes</key>
	<array>
		<string>All</string>
	</array>
	<key>IDECodeSnippetContents</key>
	<string>let alertController = UIAlertController(title: &lt;#T##String?#&gt;, message: &lt;#T##String?#&gt;, preferredStyle: &lt;#T##UIAlertController.Style#&gt;)
let firstAction = UIAlertAction(title: &lt;#T##String?#&gt;, style: .default, handler: &lt;#T##((UIAlertAction) -&gt; Void)?##((UIAlertAction) -&gt; Void)?##(UIAlertAction) -&gt; Void#&gt;)
let cancelAction = UIAlertAction(title: &lt;#T##String?#&gt;, style: .cancel, handler: nil)

alertController.addAction(firstAction)
alertController.addAction(cancelAction)
present(alertController, animated: true)</string>
	<key>IDECodeSnippetIdentifier</key>
	<string>8C458AD7-C631-457B-85CC-D2501E425D59</string>
	<key>IDECodeSnippetLanguage</key>
	<string>Xcode.SourceCodeLanguage.Swift</string>
	<key>IDECodeSnippetSummary</key>
	<string></string>
	<key>IDECodeSnippetTitle</key>
	<string>UIAlertController</string>
	<key>IDECodeSnippetUserSnippet</key>
	<true/>
	<key>IDECodeSnippetVersion</key>
	<integer>2</integer>
</dict>
</plist>

#javascript

Replace Textarea with Codemirror editor

@mishka

<link rel="stylesheet" type="text/css" href="plugin/codemirror/lib/codemirror.css">

<body>
	<textarea class="codemirror-textarea"></textarea>
</body>

<script>

$(document).ready(function(){
    var codeText = $(".codemirror-textarea")[0];
    var editor = CodeMirror.fromTextArea(codeText, {
        lineNumbers : true
    });
});

</script>

<script type="text/javascript" src="plugin/codemirror/lib/codemirror.js"></script>

#javascript

Mapping an Object

@sid

const object1 = {
  a: 'somestring',
  b: 42
};

for (let [key, value] of Object.entries(object1)) {
  console.log(`${key}: ${value}`);
}

#javascript #javascript #functions #parameters

Required Parameters for Functions in JavaScript

@Dimples

 const isRequired = () => { throw new Error('param is required'); };

const hello = (name = isRequired()) => { console.log(`hello ${name}`) };

// These will throw errors
hello();
hello(undefined);

// These will not
hello(null);
hello('David');
The idea here is that it uses default parameters, like how the b parameter here has a default if you don’t send it anything:
function multiply(a, b = 1) {
  return a * b;
}

#javascript #jquery

jQuery.post() - AJAX for post requests

@prince333

$.ajax({
  type: "POST",
  url: url,
  data: data,
  success: success,
  dataType: dataType
});

#commandline #interesting #windows #ubuntu #linux

Useful snippet to easily access Ubuntu from Windows (in WSL2)

@swellcuban

ip addr | grep eth0 | grep inet | awk '{print $2}' | awk -F '/' '{print $1}' | awk '{printf "%s:3000", $0}' | clip.exe

#javascript #nodejs

Save to MongoDB without Duplicates Using Mongoose

@bravocoder

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

const exampleSchema = new Schema({
    title: { type: String , required: true},
    content: [{type: String}]
});


var Example = mongoose.model('Example', exampleSchema);
module.exports = Example;

> More steps

#javascript

Copy Text to Clipboard with Line Breaks

@mishka

function copyToClipboard(){

    var codeToBeCopied = document.getElementById('code-snippet').innerText;
    var emptyArea = document.createElement('TEXTAREA');
    emptyArea.innerHTML = codeToBeCopied;
    const parentElement = document.getElementById('post-title');
    parentElement.appendChild(emptyArea);

    emptyArea.select();
    document.execCommand('copy');

    parentElement.removeChild(emptyArea);
    M.toast({html: 'Code copied to clipboard'})

    }

#python

Getting the index of an item in a list containing it in Python

@bravocoder

>>> ["foo", "bar", "baz"].index("bar")
1

01-addNums

@anvarbek

def addNums(a,b):
    summa = a + b
    return summa

#javascript #promises #howto

How to Get the Domain From A URL Using Javascript

@saint_r0ses

var url = "http://scratch99.com/web-development/javascript/";
var urlParts = url.replace('http://','').replace('https://','').split(/[/?#]/);
var domain = urlParts[0];

#go

go - How to convert a zero-terminated byte array to string? - Stack Overflow

@tigran

  //split by separator and pick the first one. 
  //This has all the characters till null excluding null itself.
  retByteArray := bytes.Split(byteArray[:], []byte{0}) [0]

  // OR 

  //If you want a true C-like string including the null character
  retByteArray := bytes.SplitAfter(byteArray[:], []byte{0}) [0]

#css #html

Background Image That Doesn't Scroll on Webpage

@mishka

body{
    background-image: url("img_tree.gif");
    background-repeat: no-repeat;
    background-attachment: fixed;
}

#html

Bootstrap Starter Template

@mishka

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

    <title>Hello, world!</title>
  </head>
  <body>
    <h1>Hello, world!</h1>

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
  </body>
</html>

#nodejs

Commit Changes to Heroku

@mishka

$ git status 
$ git add .
$ git commit -m "update information"
$ git push heroku master
$ git heroku open

#javascript

Loops and iteration - JavaScript | MDN

@bob

for (let step = 0; step < 5; step++) {
  // Runs 5 times, with values of step 0 through 4.
  console.log('Walking east one step');
}

#javascript

Add a Number to Two Variables At Once

@AngelGirl

 foo += -bar + (bar += 5);
// foo and bar are now 15

#ios #swift

Add Button Response in Swift

@mishka

@IBAction func doSomething()
@IBAction func doSomething(sender: UIButton)
@IBAction func doSomething(sender: UIButton, forEvent event: UIEvent)

#c++

nqueen

@rushi

#include<iostream>
using namespace std;
bool issafe(int** arr,int x,int y,int n){
    for(int row=0;row<=x;row++){
        if(arr[x][y]==1){
            return false;
        }
    }
    int row=x;
    int col=y;
    while(row>=0 && col>=0){
        if(arr[row][col]==1){
            return false;
        }
        row--;
        col--;
    }
     row=x;
     col=y;
    while(row>=0 && col<n){
        if(arr[row][col]==1){
            return false;
        }
        row--;
        col++;
    }
    return true ;
}
bool nqueen(int** arr,int x,int n){
    if(x>=n){
        return true;
    }
    for(int col=0;col<=n;col++){
        if(issafe(arr,x,col,n)){
            arr[x][col]==1;
            if(nqueen(arr,x+1,n)){
                return true;
            }
            arr[x][col]=0;  //backtracking
            
        }
    }
    return false;
}
int main(){
    int n;
    cin>>n;
    int** arr=new int*[n];
    for(int i=0;i<n;i++){
        arr[i]=new int[n];
        for(int j=0;j<n;j++){
            arr[i][j]=0;

        }
    }
    if(nqueen(arr,0,n)){
        for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
                cout<<arr[i][j]<<"";
            }cout<<endl;
        }
    }


    return 0;
}

Turbo Drive

@delitescere

<h2>Turbo Drive</h2>
<div>
  <a href="/greeting/?person=Josh">Click here to greet Josh (fast)</a>
</div>
<div>
    <a href="/greeting/?person=Josh&sleep=true">Click here to greet Josh (slow)</a>
</div>

#c++

**8.11 (Game: nine heads and tails)

@mahmoud hussein

#include <iostream>
#include<cmath>
#include<ctime>
#include<string>
#include <iomanip>
#include <fstream>

using namespace std;




void decToBinary(int n)
{
    // array to store binary number 
    int binaryNum[3][3];
    
    //converting to binary 
    for (int i = 0; i < 3; i++) 
    {
        for (int j = 0; j < 3; j++)
        {
            binaryNum[i][j] = n % 2;
            n = n / 2;

        }
     }       

    // printing binary> array in reverse order 
    for (int i = 3-1; i >= 0; i--){
        for (int j = 3 - 1; j >= 0; j--)
        {
            if (binaryNum[i][j] == 0)
                cout << "H" << " ";
            else
                cout << "T" << " ";
        }
        cout << endl;
    }
    
 }

int main()
{
    int n;
    cout << "Enter a decimal number between 1 and 512 ";
    cin >> n;

    decToBinary(n);
    return 0;
}

##kotlin,#java,#android

view binding android

@swalia

// Android Studio 4.0
android {
    buildFeatures {
        viewBinding = true
    }
}

#javascript

Add event listener to multiple buttons with the same class

@mishka

    btns = document.getElementsByClassName("saveBtn");
    for (var i = 0; i < btns.length; i++) {
        btns[i].addEventListener("click", function () {
			//Add function here
        });
    }

Retrieving Fields in Open XML WordprocessingML Documents | Eric White

@ourexpertize

static void Main(string[] args)
{
    using (WordprocessingDocument doc =
        WordprocessingDocument.Open(“Test.docx”, false))
    {
        foreach (var f in doc.MainDocumentPart.Fields())
            Console.WriteLine(“Id: {0} InstrText: {1}”, f.Id, f.InstrText);
    }
}

#nodejs

Memcached Cloud session store with express-session to preserve sessions off-server

@mishka

var express = require("express");
var app = express();
const session = require('express-session');
var MemcachedStore = require('connect-memjs')(session);

// configure sessions
var store = new MemcachedStore({servers: [process.env.MEMCACHEDCLOUD_SERVERS], username: process.env.MEMCACHEDCLOUD_USERNAME, password: process.env.MEMCACHEDCLOUD_PASSWORD});
app.use(session({ secret: 'keyboard cat',
   resave: true,
   saveUninitialized: true,
   cookie: { secure: true }, 
   store: store
}))

#java #java #arraylists #while-loops #equala

How to insert ArrayList into While-condition?

@SunLoves

List<String> songList = new ArrayList<>();
songList.add("Some song"); //Repeat until satisfied

System.out.println("\n\tWelcome! Please choose a song!");
String songChoice = scan.nextLine();
while (!songList.contains(songChoice)) {
    //Do stuff when input is not a recognised song
}

#C#

Using csvHelper to read cell content into List or Array

@Anier

The TypeConverter class is under namespace CsvHelper.TypeConversion

The TypeConverterAttribute is under namespace CsvHelper.Configuration.Attributes

    public class ToIntArrayConverter : TypeConverter
    {
        public override object ConvertFromString(string text, IReaderRow row, MemberMapData memberMapData)
        {
            string[] allElements = text.Split(',');
            int[] elementsAsInteger = allElements.Select(s => int.Parse(s)).ToArray();
            return new List<int>(elementsAsInteger);
        }

        public override string ConvertToString(object value, IWriterRow row, MemberMapData memberMapData)
        {
            return string.Join(',', ((List<int>)value).ToArray());
        }
    }
To use this converter, simply add the following TypeConverterAttribute annotations on top of your properties:
To use this converter, simply add the following TypeConverterAttribute annotations on top of your properties:

    public class Names
    {
        [Name("name")]
        public string Name { get; set; }

        [Name("numbersA")]
        [TypeConverter(typeof(ToIntArrayConverter))]
        public List<int> NumbersA { get; set; }

        [Name("numbersB")]
        [TypeConverter(typeof(ToIntArrayConverter))]
        public List<int> NumbersB { get; set; }
    }

#css #shapes

Make a circle with just CSS

@carlathemarla

<style>

 .circle:before {
                    content: ' \25CF';
                    font-size: 50px;
                    color: black;
                }
</style>

<span class="circle"></span>

#dart #flutter #layouts

How to make height of all widgets inside Row equal the tallest widget

@loop_ifthen

Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(title: Text('IntrinsicWidth')),
    body: Center(
      child: IntrinsicHeight(
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            RaisedButton(
              onPressed: () {},
              child: Text('Short'),
            ),
            RaisedButton(
              onPressed: () {},
              child: Text('A bit Longer'),
            ),
            RaisedButton(
              onPressed: () {},
              child: Text('The Longest text button'),
            ),
          ],
        ),
      ),
    ),
  );
}

#javascript #python #search #historicalcode #google #algorithms

Google’s PageRank Algorithm from 1996 - the origin of internet search

@chrissyjones

import numpy as np

def pagerank(M, num_iterations=100, d=0.85):
    N = M.shape[1]
    v = np.random.rand(N, 1)
    v = v / np.linalg.norm(v, 1)
    iteration = 0
    while iteration < num_iterations:
        iteration += 1
        v = d * np.matmul(M, v) + (1 - d) / N
    return v

#commandline #interesting #cyberattacks #security #unix

The Fork-bomb: the One-Line Virus of colons and brackets that would crash a Unix system

@happycardstwo

: ( ) { : | : & } ; :

#C #C++ #historicalcode #interesting #cyberattacks #security

The Code that made Bitcoin - exist and really secure

@albertthechecksum

double AttackerSuccessProbability(double q, int z)
{
    double p = 1.0 - q;
    double lambda = z * (q / p);
    double sum = 1.0;
    int i, k;
    for (k = 0; k <= z; k++)
    {
        double poisson = exp(-lambda);
        for (i = 1; i <= k; i++)
            poisson *= lambda / i;
        sum -= poisson * (1 - pow(q / p, z - k));
    }
    return sum;
}

#php #interesting #interviewquestions #logic

Code to count numbers on your fingers

@vasquezthefez

<?php 
function count_num_finger( $n ) 
{ 
	$r = $n % 8; 
	if ($r == 1) 
		return $r; 
	if ($r == 5) 
		return $r; 
	if ($r == 0 or $r == 2) 
		return 2; 
	if ($r == 3 or $r == 7) 
		return 3; 
	if ($r == 4 or $r == 6) 
		return 4; 
}	 

// Driver Code 
$n = 30; 
echo(count_num_finger($n)); 
 
?>

#php #interviewquestions #makethisbetter

How to find the nth Magic Number?

@marshmellow

<?php 
// PHP program to find nth 
// magic number 

// Function to find nth 
// magic number 
function nthMagicNo($n) 
{ 
	$pow = 1; 
	$answer = 0; 

	// Go through every bit of n 
	while ($n) 
	{ 
	$pow = $pow * 5; 

	// If last bit of n is set 
	if ($n & 1) 
		$answer += $pow; 

	// proceed to next bit 
	$n >>= 1; // or $n = $n/2 
	} 
	return $answer; 
} 

// Driver Code 
$n = 5; 
echo "nth magic number is ", 
	nthMagicNo($n), "\n"; 

// This code is contributed by Ajit. 
?>

#javascript

Javascript Code to Copy Text to Clipboard

@mishka

function copyToClipboard(element) {
  var $temp = $("<input>");
  $("body").append($temp);
  $temp.val($(element).text()).select();
  document.execCommand("copy");
  $temp.remove();

}

#css

Add a Mask in CSS

@mishka

img {
  mask-image: url(‘mask.png’) linear-gradient(-45deg,
                        rgba(0,0,0,1) 20%, rgba(0,0,0,0) 50%);
  mask-image: url(#masking); /*referencing to the element generated and defined in SVG code*/
}

#javascript #jquery

How to Select All Elements with jQuery

@mishka

var allElements = $("*");

#nodejs

Express Post Request to Edit Post

@mishka

router.post('/:id/edit', auth.requireLogin, (req, res, next) => {
  Post.findByIdAndUpdate(req.params.id, req.body, function(err, post) {
    if(err) { console.error(err) };

     res.redirect(`/`+req.params.id);
  });
});

#ios #swift

Check iOS Version

@mishka

[[NSProcessInfo processInfo] operatingSystemVersion]

How to upload a video to YouTube using YouTube Data API in Python - Learn Data Analysis

@admariner

import pickle
import os
from google_auth_oauthlib.flow import Flow, InstalledAppFlow
from googleapiclient.discovery import build
from googleapiclient.http import MediaFileUpload, MediaIoBaseDownload
from google.auth.transport.requests import Request


def Create_Service(client_secret_file, api_name, api_version, *scopes):
    print(client_secret_file, api_name, api_version, scopes, sep='-')
    CLIENT_SECRET_FILE = client_secret_file
    API_SERVICE_NAME = api_name
    API_VERSION = api_version
    SCOPES = [scope for scope in scopes[0]]
    print(SCOPES)

    cred = None

    pickle_file = f'token_{API_SERVICE_NAME}_{API_VERSION}.pickle'
    # print(pickle_file)

    if os.path.exists(pickle_file):
        with open(pickle_file, 'rb') as token:
            cred = pickle.load(token)

    if not cred or not cred.valid:
        if cred and cred.expired and cred.refresh_token:
            cred.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file(CLIENT_SECRET_FILE, SCOPES)
            cred = flow.run_local_server()

        with open(pickle_file, 'wb') as token:
            pickle.dump(cred, token)

    try:
        service = build(API_SERVICE_NAME, API_VERSION, credentials=cred)
        print(API_SERVICE_NAME, 'service created successfully')
        return service
    except Exception as e:
        print('Unable to connect.')
        print(e)
        return None

def convert_to_RFC_datetime(year=1900, month=1, day=1, hour=0, minute=0):
    dt = datetime.datetime(year, month, day, hour, minute, 0).isoformat() + 'Z'
    return dt

#r

How to Combine Multiple GGPlots into a Figure - Datanovia

@ztlee042

library(ggplot2)
library("ggpubr")
theme_set(
  theme_bw() +
    theme(legend.position = "top")
  )

How to Save HTML Form Data in JSON - Express

Get URL and URL Parts in JavaScript

f5

The Vancouver Stock Exchange’s Rounding Error that Dropped the Market Value by Half

HTTPS Redirect in Nodejs

Append a Value to an Array

Full Stack Developer

Detecting combination keypresses (Control, Alt, + Keyboard Letter)

getAttribute() - how to get the value of any attribute of HTML element

Alert Controller for Swift 5 in Xcode

Replace Textarea with Codemirror editor

Mapping an Object

Required Parameters for Functions in JavaScript

jQuery.post() - AJAX for post requests

Useful snippet to easily access Ubuntu from Windows (in WSL2)

Save to MongoDB without Duplicates Using Mongoose

Copy Text to Clipboard with Line Breaks

Getting the index of an item in a list containing it in Python

01-addNums

How to Get the Domain From A URL Using Javascript

go - How to convert a zero-terminated byte array to string? - Stack Overflow

Background Image That Doesn't Scroll on Webpage

Bootstrap Starter Template

Commit Changes to Heroku

Loops and iteration - JavaScript | MDN

Add a Number to Two Variables At Once

Add Button Response in Swift

nqueen

Turbo Drive

**8.11 (Game: nine heads and tails)

view binding android

Add event listener to multiple buttons with the same class

Retrieving Fields in Open XML WordprocessingML Documents | Eric White

Memcached Cloud session store with express-session to preserve sessions off-server

How to insert ArrayList into While-condition?

Using csvHelper to read cell content into List or Array

Make a circle with just CSS

How to make height of all widgets inside Row equal the tallest widget

Google’s PageRank Algorithm from 1996 - the origin of internet search

The Fork-bomb: the One-Line Virus of colons and brackets that would crash a Unix system

The Code that made Bitcoin - exist and really secure

Code to count numbers on your fingers

How to find the nth Magic Number?

Javascript Code to Copy Text to Clipboard

Add a Mask in CSS

How to Select All Elements with jQuery

Express Post Request to Edit Post

Check iOS Version

How to upload a video to YouTube using YouTube Data API in Python - Learn Data Analysis

How to Combine Multiple GGPlots into a Figure - Datanovia

Save snippets that work with our extensions