mirajehossain

let arr = [1,2,3,4,5];
/// with initial value
let result = arr.reduce((accumulator,currentValue,currentIndex,array)=>{
  console.log(`result: ${accumulator}, current value: ${currentValue}, index: ${currentIndex}, array: ${array} `);
  return accumulator + currentValue;
},0);
///OUTUT:
result: 0, current value: 1, index: 0, array: 1,2,3,4,5 
result: 1, current value: 2, index: 1, array: 1,2,3,4,5 
result: 3, current value: 3, index: 2, array: 1,2,3,4,5 

mirajehossain

let persons = [
   { name: 'John', age: 25, gender: 'male'},
   { name: 'Doe',  age: 35, gender: 'male'},
   { name: 'Nayla',age: 18, gender: 'female'},
   { name: 'Alex', age: 21, gender: 'female'}, 
   { name: 'Jane', age: 22, gender: 'male'}
];

let age = persons.filter((person)=>{
  return person.gender === 'male';

mirajehossain

const express = require('express');
const logger = require('morgan');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
const multer = require('multer');
const index = require('./routes/index');

const app = express();

mirajehossain

/*
{
  "status": true,
  "message": "Message",
  "statusCode": 200,
  "data": {
    "access_token": "mytoken here"
  }
}
*/

mirajehossain

import 'dart:async';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:flutter_sqflite_app/model/user.model.dart';


class ApiService {
  static final BASE_URL = "https://xxxxxxxx.herokuapp.com";
  static final LOGIN_URL = BASE_URL + "/auth/v1/users/login";

mirajehossain

/*
 * Inspired by: http://stackoverflow.com/questions/4360060/video-streaming-with-html-5-via-node-js
 */

var http = require('http'),
    fs = require('fs'),
    util = require('util');

http.createServer(function (req, res) {
  var path = 'video.mp4';

mirajehossain

#install mongodb

# Step 1 - Import the public key used by the package management system

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 68818C72E52529D4


# Step 2 - Create source list file MongoDB

#Create a MongoDB list file in /etc/apt/sources.list.d/ with this command:

mirajehossain

{
  "board": [{
    "title": "Barisal board",
    "boardDistricts": {
      "districts": [
        {
          "title": "Barisal",
          "thana": ["Muladi Upazila", "Babuganj Upazila", "Agailjhara Upazila", "Barisal Sadar Upazila", "Bakerganj Upazila", "Banaripara Upazila", "Gaurnadi Upazila", "Hizla Upazila", "Mehendiganj Upazila", "Wazirpur Upazila"]
        },
        {

mirajehossain

const otpGenerator = require("otp-generator");
const crypto       = require("crypto");
const key          = "verysecretkey"; // Key for cryptograpy. Keep it secret

function createNewOTP(phone){
    // Generate a 6 digit numeric OTP
    const otp      = otpGenerator.generate(6, {alphabets: false, upperCase: false, specialChars: false});
    const ttl      = 5 * 60 * 1000; //5 Minutes in miliseconds
    const expires  = Date.now() + ttl; //timestamp to 5 minutes in the future
    const data     = `${phone}.${otp}.${expires}`; // phone.otp.expiry_timestamp

mirajehossain

Ubuntu-Server-Hardening

1. Secure Shared Memory

What is shared memory?

Shared memory is an efficient means of passing data between programs. Because two or more processes can use the same memory space, it has been discovered that, since shared memory is, by default, mounted as read/write, the /run/shm space can be easily exploited. That translates to a weakened state of security.

If you’re unaware, shared memory can be used in an attack against a running service. Because of this, you’ll want to secure that portion of system memory.