Berlin Clock

Berlin ClockCodewars

Approach

Find pattern

• top line is second based tic (true false)

• second line is a quotient of ( hour / 5)

• third line is remainder of (hour /5)

• forth line is a quotient (minute / 5)

• fifth line is remainder of (hour / 5)

Solve the problem

1. split value use separator ':' and convert to number

2. Get the value of each pattern specified above and convert it to units

3. convert light color

   1. top line must yellow ('Y')

   2. second line must red ('R')

   3. third line must red ('R')

   4. forth line must yellow ('Y') and each third unit must be red ('R')

   5. fifth line must yellow ('Y')

Solution

JavaScript

// Berlin Clock
// https://www.codewars.com/kata/5a1463678ba9145a670000f9

const convertToUnit = (arraySize, value) => new Array(arraySize).fill(0)
  .map((v, i) => i < value);

const berlinClock = (time) => {
  const [hh, mm, ss] = time.split(':').map(Number);
  
  return [
    ss % 2 === 0 ? ['Y'] : ['O'],
    convertToUnit(4, Math.floor(hh / 5))
      .map((v) => v ? 'R' : 'O'),
    convertToUnit(4, hh % 5)
      .map((v) => v ? 'R' : 'O'),
    convertToUnit(11, Math.floor(mm / 5))
      .map((v, i) => v ? (i % 3 !== 2 ? 'Y' : 'R') : 'O'),
    convertToUnit(4, mm % 5)
      .map((v) => v ? 'Y' : 'O'),
  ].map((v) => v.join(''))
    .join('\n');
};