week4

diagonalDifference.js

function diagonalDifference(arr) {
   let line1 = 0;
   let line2 = 0;
   for (let i = 0; i < arr.length; i++) {
      line1 += arr[i][i];
      line2 += arr[i][arr.length - 1 - i];
   }
   let sum = Math.abs(line1 - line2);
   return sum;
}

kangaroo.js

function kangaroo(x1, v1, x2, v2) {
   let boolean = "NO";

   for (let i = 0; i < 10000 && boolean === "NO"; i++) {
      let kang1 = x1 + v1 * i;
      let kang2 = x2 + v2 * i;
      if (kang1 === kang2) boolean="YES";
   }
   return boolean;
}

saveThePrisoner.js

function saveThePrisoner(n, m, s) {

   let lucky = 0;
   if (n > m) lucky = s + m - 1;
   if (n <= m) {
      if (m % n !== 0) lucky = m % n - 1 + s;
      if (m % n === 0) {
         if (s === 1) {
            lucky = n + s - 1;
         } else {
            lucky = s - 1;
         }
      }
   }
   if (lucky > n) lucky -= n

   return lucky;
}

timeConversion.js

function timeConversion(s) {
   let time = s.slice(0, 8);
   let ampm = s.slice(8);
   let parse = time.split(':').map(el => parseInt(el));
   if (ampm === 'PM') {
      if (parse[0] === 12) {
          parse[0] = 12
      } else {
         ((+parse[0] + 12) == 24) ? parse[0] = 0: parse[0] += 12
      }
   } else {
      if (parse[0] === 12) parse[0] = 0
   }
    
   for (let i in parse) {
      if (parse[i] < 10) {
         parse[i] = '0' + parse[i] 
      }
   }
   return parse.join(':')
}