×
Night mode
Sign up
Login
Results: 1578
Notes
  • Newest first
  • Oldest first
  • Newest first(All)
  • Oldest first(All)
Convert seconds to HH:MM:SS in JAVA
IMPORTS: 
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
import java.util.TimeZone;

 
Scanner scan = new Scanner(System.in);
        System.out.print("");

        int num = scan.nextInt();
        scan.close();

        TimeZone tz = TimeZone.getTimeZone("UTC");
            SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
        df.setTimeZone(tz);
        String time = df.format(new Date(num * 1000));
        System.out.println(time);
by Luka Tatarishvili
3 years ago
0
JAVA
0
How do I add an empty directory to a Git repository? 
create a .gitignore file inside that directory that contains these four lines
# Ignore everything in this directory
*
# Except this file
!.gitignore
by Luka Tatarishvili
3 years ago
0
0
Make an object from a string 
function mapString(string) {
  let map = {};
  for (let i = 0; i < string.length; i++) {
    let letter = string[i];
    if (map[letter]) {
      map[letter].push(i);
    } else {
      map[letter] = [i];
    }
  }
  return map;
}
console.log(mapString('blblllaaha'))
by Valeri Tandilashvili
3 years ago
0
JavaScript
objects
0
How FOR loop works
In the example code below the loop flows through these steps: Setting initial variable value of i to 0 Testing if the loop should be running while i is 0 Running the code block console.log(i) Updating i to be 1 Testing if the loop should be running while i is 1 Running the code block console.log(i) Updating i to be 2 Testing if the loop should be running while i is 2 This means the code will log 0 and 1 to the console. 
for (let i = 0; i < 2; i++) {
   console​.log(i)
}
by Valeri Tandilashvili
3 years ago
0
JavaScript
FOR loop
0
falsy values
In JavaScript, there are 6 falsy values:
1. false: the boolean value false
2. 0: the number zero
3. '': the empty string, a string with no characters
4. NaN : stands for "Not a Number", usually caused by math errors
5. undefined: a variable's value before it is assigned a value
6. null: a blank value that can be assigned to a variable
by Valeri Tandilashvili
3 years ago
0
JavaScript
0
Declare a variable that will be use later to return
In many functions, it is useful to declare a variable for the function to later return. For example:
function calculateSum(numberArray) {
    let sum = 0;
    for (let num of numberArray) {
        sum += num;
    }
    return sum;
}
by Valeri Tandilashvili
3 years ago
0
JavaScript
return
0
return false if any member is greater than 4
The following function will return false if any number in an array of numbers is greater than 4. Otherwise, the function will return true
function lessThanFive(numbers) {
  for (let number of numbers) {
    if (number > 4) {
      return false;
    }
  }
  return true;
}
by Valeri Tandilashvili
3 years ago
0
JavaScript
return
0
Multiple return in a function
It can be useful to have multiple returns in a function declaration as long as only 1 return is expected to run. For example:
function invert(x) {
  if (x === 0) {
     return 'input was zero';
  } else {
    return 1 / x;
  }
}
The function will still work using an if statement instead of an if...else statement
function invert(x) {
  if (x === 0) {
     return 'input was zero';
  }
  return 1 / x;
}
by Valeri Tandilashvili
3 years ago
0
JavaScript
return
0
Open cmd in current folder
Step 1: 
press ALT + D
Step 2: 
type  CMD and pressed Enter
When pressing ALT + D , typing in CMD and pressed Enter when on This PC (and Quick Access) via File Explorer, it opens up the command prompt in the C:\WINDOWS\system32 directory
by Luka Tatarishvili
3 years ago
0
cmd
command line
0
Class extends EventEmitter class CODE
Content of the logger module
const EventEmitter = require('events');

class Logger extends EventEmitter {
  log(message) {
    
    // Log the message
    console.log(message);
    
    // Raise an event
    this.emit('messageLogged', { id: 1, url: 'http://' });
  }
}

module.exports = Logger;
Content of the index file
const Logger = require('./logger');
const logger = new Logger();

// Register a listener
logger.on('messageLogged', function(arg) {
  console.log('Listener called', arg);
});

logger.log('message');
by Valeri Tandilashvili
3 years ago
0
Node
Events
Node.js Tutorial for Beginners - 1 Hour
0
Results: 1578