mirajehossain

Setter/Tester tips are shared here -> https://gist.github.com/shashank21j/64830e7e3dab96a2ccb8

Creating a Contest on HackerRank is an easy process which is divided in 2 steps.

1. Create a Challenge
2. Create a Contest.

#1. Create a Challenge

mirajehossain

const express    = require('require');
const app        = express();
const bodyParser = require('body-parser');
const morgan     = require('morgan');
const port       = process.env.PORT || 8080;

app.use(bodyParser.urlencoded({extended:false}));
app.use(bodyParser.json());
app.use(morgan('dev'));

mirajehossain

Javascript Handbook

A hand crafted markdown document contains all major Javascript topics covered, taken from different sources. Brush Up your JS memory.

Comments

---

Single line comments start with //. For multi-line commands, you use /* ... */

// This is a single line comment

mirajehossain

/**
*   Create a student class and two overloading constructor which are takes parameters,
*   create array of object and set two constructor dynamically and print information.
**/

#include<iostream>
using namespace std;

class student
{

mirajehossain

let arr= [1,2,3,4,5,6,7,8,9,10];
let newArr = arr.map(item => {
 return item % 2 == 0? item * item : item;
});
console.log(newArr);
/// OUTPUT:  [1, 4, 3, 16, 5, 36, 7, 64, 9, 100]

mirajehossain

let numbers = [1,2,3,4,5,6,7,8,9];
let newNumbers = numbers.map(function(item){
  return item+5;
});
console.log(newNumbers);
/// OUTPUT: [6, 7, 8, 9, 10, 11, 12, 13, 14]

/**
*  আরো সহজ ভাবে es6 এ অ্যারো ফাংশন ব্যবহার করে
*  লিখাযায়

mirajehossain

let departments = [
 { name: 'CSE',    student: 7000},
 { name: 'EEE',    student: 2000},
 { name: 'CSIT',   student: 5000},
 { name: 'ME',     student: 4500},
 { name: 'ENGLISH',student: 6000},
 { name: 'BBA',    student: 8000},
 { name: 'LAW',    student: 2500}
];

mirajehossain

let newDepartments = departments.filter(department=>{
 return department.student<=5000;
});
//output:
  [ 
      { name: 'EEE',    student: 2000}, 
      { name: 'CSIT',   student: 5000}, 
      { name: 'ME',     student: 4500}, 
      { name: 'LAW',    student: 2500}
  ]

mirajehossain

let numbers = [1,2,3,4,5,6,7,8,9,10];
// using for loop
let evenNumbers = [];
for(let i=0; i<numbers.length; i++){
  if(numbers[i] % 2 === 0) evenNumbers.push(numbers[i]);
}
console.log(evenNumbers);

// using filter
let evenNumbers = numbers.filter(item=> item % 2 === 0);

mirajehossain

let arr = [1,2,3,4,5];

let result = arr.reduce((accumulator,currentValue)=>{
  return accumulator + currentValue;
});
console.log(result); /// 15