자바스크립트 알고리즘(2)

<문제>
숫자 배열이 주어졌을 때 10보다 큰 숫자의 갯수를 반환하는 함수를 만드세요

<풀이>

• foreach 사용

function countBiggerThanTen(numbers) {
  let count = 0;
  numbers.forEach(n =>{
    if(n>10){
      count ++;
    }
  })
  return count;
}

const count = countBiggerThanTen([1, 2, 3, 5, 10, 20, 30, 40, 50, 60]);
console.log(count); // 5

export default countBiggerThanTen;

• filter 사용

function countBiggerThanTen(numbers) {
  return numbers.filter(n => n > 10).length;
}

const count = countBiggerThanTen([1, 2, 3, 5, 10, 20, 30, 40, 50, 60]);
console.log(count); // 5

export default countBiggerThanTen;

• reduce 사용

function countBiggerThanTen(numbers) {
  return numbers.reduce((acc, current) => {
    if (current > 10) {
      return acc + 1;
    } else {
      return acc;
    }
  }, 0);
}

const count = countBiggerThanTen([1, 2, 3, 5, 10, 20, 30, 40, 50, 60]);
console.log(count); // 5

export default countBiggerThanTen;