Model Relations

Relations are logical links which define how models are connected with each other. A document of a model can be connected to one or more documents of the same or another model.

Crypto Compare

Crypto Compare is a website and API provider which brings you all the latest streaming pricing data in the world of cryptocurrencies. Their API documentation is available here.

@abskmj/query

It is an NPM module that converts complex JSON with arrays and nested objects into URL parameters or query string. It can also parse such query string back to JSON.

Solution

/* Solution to HackerRank: Divisible Sum Pairs
 * URL: https://www.hackerrank.com/challenges/divisible-sum-pairs
 */
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {

    // Complete the divisibleSumPairs function below.
    static int divisibleSumPairs(int n, int k, int[] ar) {
        int count = 0;
        
        for(int i=0; i < n; i++){
            for(int j=i+1; j < n; j++){
                if((ar[i]+ar[j])%k == 0){
                    count++;
                }
            }
        }

        return count;
    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] nk = scanner.nextLine().split(" ");

        int n = Integer.parseInt(nk[0]);

        int k = Integer.parseInt(nk[1]);

        int[] ar = new int[n];

        String[] arItems = scanner.nextLine().split(" ");
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        for (int i = 0; i < n; i++) {
            int arItem = Integer.parseInt(arItems[i]);
            ar[i] = arItem;
        }

        int result = divisibleSumPairs(n, k, ar);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}

Solution

/* Solution to HackerRank: The Time in Words
 * URL: https://www.hackerrank.com/challenges/the-time-in-words
 */
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {

    // Complete the timeInWords function below.
    static String timeInWords(int h, int m) {
        String[] words = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty"};
        
        if (m == 0){
            return words[h] + " o' clock";
        } else if (m == 15){
            return "quarter past " + words[h];
        } else if (m == 30){
            return "half past " + words[h];
        } else if (m == 45){
            return "quarter to " + words[h+1];
        } else if (m == 1){
            return "one minute past " + words[h];
        } else if (m == 59){
            return "one minute to " + words[h+1];
        } else if (m < 21){
            return words[m] + " minutes past " + words[h];
        } else if (m > 39){
            return words[60-m] + " minutes to " + words[h+1];
        } else if (m > 30){
            return "twenty " + words[(60-m)%20] + " minutes to " + words[h+1];
        }
        else{            
            return "twenty " + words[m%20] + " minutes past " + words[h];
        }

    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int h = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        int m = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        String result = timeInWords(h, m);

        bufferedWriter.write(result);
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}

Update NodeJS version

• All of the blank VMs on cloud9 have nvm pre installed.
• List all the available versions from the official site.

nvm ls-remote

• Choose to install the latest version

nvm install v10.6.0

• Choose to use the latest version

nvm use v10.6.0

• Check the version in use

node --version

Angular

• Install latest Angular CLI package

npm install -g @angular/cli

• Create a new project named my-project (you can use any name you need)

ng new my-project
cd my-project

• Change start script in package.json

{
  ...
  
  "scripts": {
    ...
    
    "start": "ng serve --host $IP  --port $PORT --public-host $C9_HOSTNAME",
    
    ...
  }
  
  ...
}

• On IDE menu, click on Preview > Preview Running Application to get the preview URL.

Downside

Everything works perfectly expect that the live reload, sometimes, is slower than usual.

Glitch is a online workspace that support javascript for development with live previews.

I have recently installed LineageOS custom ROM on my OnePlus2 device to keep on trying new android versions as they come. While installing/updating the OS, I was getting below error on TWRP recovery screen.

Proxy settings can be changed in {{maven_installation_folder}}/conf/settings.xml. Un-comment and change the values in proxies section of the file. Changes to this file doesn’t require maven restart.

Remote Repository on Deployment Server

Create two folders named project.git and project.source. Create a bare git repo in project.git