Konstantin Petrov

Code Examples

• Return the time given the angle of the hour-hand
  

              
  var whatTimeIsIt = function(angle) {
    const totalMinutes = Math.floor(angle * 2);
    const hours = Math.floor(totalMinutes / 60) || 12;
    const minutes = totalMinutes % 60;
    const actualHour = String(hours).padStart(2, '0');
    const actualMinute = String(minutes).padStart(2, '0');
    const actualTime = `${actualHour}:${actualMinute}`;
    return actualTime;
  }
              
            

• Is a number prime?
  

                  
  function isPrime(num) {
    if (num <= 1) {
      return false;
    }
    if (num === 3 || num === 2) {
      return true;
    }
    if (num % 2 === 0 || num % 3 === 0) {
      return false;
    }
    for (let i = 5; i * i <= num; i += 6) {
      if (num % i === 0 || num % (i + 2) === 0) {
        return false;
      }
    }
    return true;
  };
              
            

• Return the number of bits given integer as input
  

              
  var countBits = function(n) {
    let binary = n.toString(2);
    let bits = binary.split('1');
    return bits.length - 1;
  };
              
            

• Split the string into pairs of two characters
  

              
  function solution(str) {
    let word = str;
    let result = [];
    if ((str.length % 2) !== 0) {
      word = word + '_';
    }
    for (let i = 0; i < word.length; i += 2) {
      result = result.concat(word.slice(i, (i + 2)));
    }
    return result;
  }
              
            

• Reverse a stream of received data
  

              
  function dataReverse(data) {
    let result = [];
    for (let i = data.length; i >= 0; i -= 8) {
      result = result.concat(data.slice((i - 8), i));
    }
    return result;
  }