numberToReversedArray.js (8kyu 24)

in about Dev on Algorithm

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Description

  • Given a random non-negative number, you have to return the digits of this number within an array in reverse order.
    • 음수가 아닌 숫자를 역순 배열로 반환한다.



Solution 01

function numberToReversedArray(n) {
  let str = n.toString();
  let result = [];
  
  for (let i = str.length - 1; i >= 0; i--) {
    result.push(Number(str[i]));
  }
  
  return result;
}

numberToReversedArray(1234);  // [4, 3, 2, 1]
numberToReversedArray(4321);  // [1, 2, 3, 4]


Solution 02

function numberToReversedArray(n) {
  return n.toString().split('').reverse().map(i => +i);
}

numberToReversedArray(1234);  // [4, 3, 2, 1]
numberToReversedArray(4321);  // [1, 2, 3, 4]


Solution 03

function numberToReversedArray(n) {
  return n.toString().split('').reverse().map(Number);
}

numberToReversedArray(1234);  // [4, 3, 2, 1]
numberToReversedArray(4321);  // [1, 2, 3, 4]