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#javascript #interesting #historicalcode #leftpad

Leftpad: 11 lines of code that broke the internet in 2016

@bluespin223 

module.exports = leftpad;
function leftpad (str, len, ch){
   str = String(str);
   var i = -1;
   if (!ch && ch !== 0) ch = ' ';
   len = len - str.length;
   while (++i < len){
      str = ch + str;
   }
   return str;
}
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#interesting #BASIC #funcode

Create an intricate maze of /'s and \'s with just one line of BASIC code

@divisionjava 

10 PRINT CHR$ (205.5 + RND (1)); : GOTO 10
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#haskell #interesting #functionalprogramming #quicksort #elegantcode

Explaining Quicksort in Haskell line by line

@divisionjava 

quicksort :: Ord a => [a] -> [a] 
quicksort [] = [] 
quicksort (p:xs) = (quicksort lesser) ++ [p] ++ (quicksort greater) 
  where 
     lesser = filter (< p) xs 
     greater = filter (>= p) xs
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#algorithms #logic #interesting

Floyd's Cycle Detection Algorithm - aka "The Tortoise and the Hare"

@solitaire_4_07 

tortoise = top
hare = top

forever:
     if hare == end :
         return 'No Loop Found'
     hare = hare.next
 
     if hare == end :
         return 'No Loop Found'
     hare = hare.next
 
     tortoise = tortoise.next
 
     if hare == tortoise:
         return 'Loop Found'
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#java #howto #interviewquestions #mobile

How to use Java Swing to create a button

@price_the_ice 

import javax.swing.*;  
public class FirstSwingExample {  
public static void main(String[] args) {  
JFrame f=new JFrame();//creating instance of JFrame  
          
JButton b=new JButton("click");//creating instance of JButton  
b.setBounds(130,100,100, 40);//x axis, y axis, width, height  
          
f.add(b);//adding button in JFrame  
          
f.setSize(400,500);//400 width and 500 height  
f.setLayout(null);//using no layout managers  
f.setVisible(true);//making the frame visible  
}  
}
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#javascript #errors #howto

Handle Javascript errors with try-catch, throw and finally

@new_roman11 

try {
  let hello = prompt("Type hello");
  if (hello !== 'hello'){
    throw new Error("Oops, you didn't type hello");
  }
}
catch(e) {
  alert(e.message);
}
finally {
  alert('thanks for playing!');
}
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#html #python #xhtml

Implementing HTML and XHTML parser in Python

@_clones_jones_ 

from html.parser import HTMLParser

class MyHTMLParser(HTMLParser):
    def handle_starttag(self, tag, attrs):
        print("Encountered a start tag:", tag)
    def handle_endtag(self, tag):
        print("Encountered an end tag :", tag)
    def handle_data(self, data):
        print("Encountered some data  :", data)

parser = MyHTMLParser()
parser.feed('<html><head><title>Test</title></head>'
            '<body><h1>Parse me!</h1></body></html>')
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#ios #swift #apps #loops

Detect and remove code loops in Swift

@goblindoom95 

#include <iostream>
#include "unordered_set"
#include "basicActions.h"
using namespace std;

void createLoop(Node *head)
{
    Node *p = head;

    while (p->next != nullptr)
    {
        p = p->next;
    }
    p->next = head;
    return;
}

bool detectLoop(Node *head)
{
    unordered_set<Node *> s;
    Node *p = head;

    while (p != nullptr)
    {
        if (s.find(p) != s.end())
            return true;

        s.insert(p);
        p = p->next;
    }
    return false;
}

int main()
{
    Node *head = nullptr;
    insertAtEnd(head, 1);
    insertAtEnd(head, 2);
    insertAtEnd(head, 3);
    insertAtEnd(head, 4);
    insertAtEnd(head, 5);

    createLoop(head);

    detectLoop(head) ? cout << "Loop Detected.." << '\n' : cout << "No Loop Detected.." << '\n';
}
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#ios #swift #apps #hash #security

How to do basic hash in swift

@goblindoom95 

#include <iostream>
using namespace std;

struct hashing
{
    int value;
    int key;
};


void put(int value, hashing hash[],int n) {
    hash[value % n].value = value;
    hash[value % n].key = (value % n);
}

int get(int key, hashing hash[]) {
    return hash[key].value;
}

int main()
{
    int n;
    
    struct hashing hash[n];
    cin >> n;
    for (int t=0;t<n;t++) {
        put(t+1,hash,n);
        cout << "Inserted : " << (t+1) << endl;
    }
    int temp;
    cin >> temp;
    cout << get(temp,hash) << endl;
}
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#php #webdev #howto

Convert one date format into another in PHP

@Catsndogs 

$myDateTime = DateTime::createFromFormat('Y-m-d', $dateString);
$newDateString = $myDateTime->format('m/d/Y');
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#javascript #webdev #arrays #math

Function to find the minimum value in Javascript Arrays

@bezequi 

const arrMin = arr => Math.min(...arr);
// arrMin([20, 10, 5, 10]) -> 5
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#javascript #webdev #javascript #arrays #math

Function to find maximum value in javascript array

@bezequi 

const arrMax = arr => Math.max(...arr);
// arrMax([20, 10, 5, 10]) -> 20
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#javascript #webdev #arrays #math

Get average value of items in a javascript array

@bezequi 

const arrAvg = arr => arr.reduce((a,b) => a + b, 0) / arr.length
// arrAvg([20, 10, 5, 10]) -> 11.25
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#html #htmltags #webdev #basics #html5

Image tag <img> to insert images

@toast-ghost 

<img 
	src="example.com/cat.png" 
    alt="Photo of a cat" 
    height="50" 
    width="100"
    longdesc="#catDetails"
 >
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#css #design #gradient #webdev

Radial Gradient in CSS

@solitaire_4_07 

.gradient {
  background-image:
    radial-gradient(
      yellow,
      #f06d06
    );
}

String Magic

 @frogblog #javascript
How to Get the Domain From A URL Using Javascript Capitalize the first letter of a String Check String contains Substring Method

HTML Tags

 @toast-ghost #html
HTML Heading Tags <h1> to <h6> Image tag <img> to insert images

Things you can do with Arrays

 @mishka #javascript
Get average value of items in a javascript array Append a Value to an Array How to Access Clicked Element From an Array With the Same Class Function to find the minimum value in Javascript Arrays Function to find maximum value in javascript array Get sum of all values in javascript array mongodb - How to find items using regex in Mongoose for partial text search

Gradient Backgrounds

 @solitaire_4_07 #css
Radial Gradient in CSS How to Make a Linear Gradient in CSS CSS Repeating Gradients to Create Stripes or Radial patterns

Python Functions from "30 Seconds of Code"

 @peterents #python
Python when function - to apply a function when predicate(x) is True Python compose function - performs right-to-left function composition Build a list using an iterator Python unfold function

Select HTML elements with jQuery

 @new_roman11 #html #javascript
How to Select All Elements with jQuery How to Select Specific Elements with jQuery Select Elements with Class Attribute using jQuery

Time and Dates

 @new_roman11 #javascript
How to Get Current Year in Javascript How to dynamically update your site's copyright year Display Date Objects in Shorter Format - MMM DD YYY HH:MM

Stuff you can do with Python Lists

 @mishka #python
How to list all files of a directory in Python Check if a list is empty in Python Getting the index of an item in a list containing it in Python Build a list using an iterator Python unfold function Clone or copy a list in Python

JS Methods for Numbers

 @goblindoom95 #javascript
toString() - Convert numbers to string toExponential() - Round off numbers in exponential notation toFixed() Method - convert number to string with fixed number of decimal places The valueOf() Method - Returns number of mathematical expression or number variable parseInt() Method - returns a whole number from a string

Dealing with JSON

 @mishka #javascript
Creating a JSON Object in Javascript JSON.stringify() - convert objects into JSON JSON.parse() - convert string into a JavaScript object

Changing HTML with Javascript

 @_right_away_ #html #javascript
How to change any attribute of a HTML element How to change any attribute of a HTML element innerHTML - How to get or change the inside of a HTML element

Use of Dictionary in Python

 @PinkGarden #python
Merge two dictionaries Create dictionary of months by using keywords and shorthand that prints full month name How to delete words from dictionary - by using keyword “del”

Clojure Functions

 @deku
Anonymous function syntax

Node Cookies

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

Chrome Extension Snippets

 @faustj4r
Exclude and Include Matches for Content Scripts in Google Chrome
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