khalid32

** The abs Function
abs(3) ==> 3
abs(0) ==> 0
abs(-3) ==> 3

** The int Function
int(2.7) ==> 2
int(-2.7) ==> -2

** The round() Function

khalid32

constructor() {
        super()
        this.state = {}
    }
    
    static getDerivedStateFromProps(props, state) {
        // return the new, updated state based upon the props
        // https://reactjs.org/docs/react-component.html#static-getderivedstatefromprops
        // https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html
    }

khalid32

/* Binary Search */

/* Typical comparison function */
let defaultCompare = (a, b) => a > b ? 1 : (a < b ? -1 : 0);

// Binary Search With Loop
let binarySearch = (array, element, compare = defaultCompare) => {
    let left = 0;
    let right = array.length - 1;
    

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function range(start, end){
    if(end != undefined){
        if(start <= end){
            return getRange(start, end);
        }else{
            return 0;
        }
    }else{
        return function innerFunction(innerVariable){
            if(start <= innerVariable){

khalid32

// === Binary to Decimal Conversion Example ===

var binary = "10";
var digit = parseInt(binary, 2);
console.log(' digit --> ',digit);

// === Decimal to Binary Conversion Example ===

var str = "2";
var bin = (+str).toString(2);

khalid32

### extract videos as mp3 files
youtube-dl -x --audio-format mp3 <video link>

### get highest resolution audio & video
To download a video, you type the URL after the command like so:

youtube-dl <video link>

To select the video quality, first use the -F option to list the available formats, here’s an example,

khalid32

/*
 Here is a simple code to use 280 colors on web & app design. Here I focus on "RGBA" format so developer can also control opacity. 
 For example, you can invoke functions as `FlatUI().black` where opacity is by default 1 when argument is blank.
 You don't need to put floating number; just place a number range [0, 9] to control opacity.
*/

const getIntNumber = (getNumber) => {
    switch(getNumber){
        case 0:
            return 0.0; break;

khalid32

## 1. makeFeature
###### function makeFeature(geometry, properties)
Output -->

{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "properties": {
      "screenPointY": 839,

khalid32

const array = ['a', 'b', 'c', 'd', 'e'];
const [first, ,third, ,last] = array;

// is similar to this below..

const array = ['a', 'b', 'c', 'd', 'e'];

const iterator = array[Symbol.iterator]();

const first = iterator.next().value

khalid32

// Requires Express, as before.
let express = require("express");

// Requires Morgan.
let morgan = require("morgan");

let app = express();

// Uses the Morgan middleware instead of the one you used to have.
let morganMiddleware = morgan("short");