reto de mayo

solutions.js

// Solutions in Javascript for the Chillin & Grillin
// coding event @ Geekdom
function numword (num) {
  const numwords = [
    'Zero','One','Two','Three','Four',
    'Five','Six','Seven','Eight','Nine'
  ];
  return numwords[num]
}

// no worky :(
function excelCol (num) {
  const KEY = 'abcdefghijklmnopqrstuvwxyz'.toUpperCase().split('');
  let result = [];
  const places = [729, 27, 1];

  if (!num) return 'A';

  for (const place of places) {
    let val = Math.floor(num / place); /*?*/
    if (val >= 1) {
      num -= place * val;
      result.push(KEY[ val - 1])
    } else { result.push(' ') }
  } 
  while (result[0] === ' ') {
    console.log('poppin');
    result.shift();
  }
  return result.map( (val,idx,arr) => {
    return val === ' ' ? 'A' : val;
  }).join('');
  
}

function isPalindrome (num) {
  let numStr = String(num);
  return numStr === numStr.split('').reverse().join('');
}

function countFours (num) {
  let count = 0;
  for (let i = 0; i <= num; i++) {
    if (String(i).includes('4')) {
      count++;
    }
  }
  return count;
}

function countFactorials (low, high) {
  function factorial(num)  
  {  
    if (num < 0) {  
      return -1;  
    }  
    else if (num == 0) {  
      return 1;  
    }  
    let tmp = num;  
    while (num-- > 2) {  
      tmp *= num;  
    }  
    return tmp;  
  }  
  count = 0;
  for (let i = 1; factorial(i) <= high; i++) {
    const test = factorial(i);
    if (test < low) {
      continue;
    }
    count++;
  }
  return count;
}

console.log(excelCol(28));