[Codewars] Binary Addition (7 kyu) / JavaScript

https://www.codewars.com/kata/551f37452ff852b7bd000139

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DESCRIPTION:

Implement a function that adds two numbers together and returns their sum in binary. The conversion can be done before, or after the addition.

The binary number returned should be a string.

Examples:(Input1, Input2 --> Output (explanation)))

1, 1 --> "10" (1 + 1 = 2 in decimal or 10 in binary)
5, 9 --> "1110" (5 + 9 = 14 in decimal or 1110 in binary)

 

설명:

두 숫자를 더한 합을 이진수로 반환하는 함수를 구현하세요. 변환은 덧셈 전이나 후에 실행될 수 있습니다.

반환된 2진수는 문자열이어야 합니다.

예시:(Input1, Input2 --> Output (explanation)))

1, 1 --> "10" (1 + 1 = 2 in decimal or 10 in binary)
5, 9 --> "1110" (5 + 9 = 14 in decimal or 1110 in binary)

 

풀이

function addBinary(a,b) {
  return (a + b).toString(2);
}

toString을 사용해서 a, b의 합을 2진수로 바꾸었다.

 

참고

https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Number/toString

Number.prototype.toString() - JavaScript | MDN