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[TestDom] JavaScript 문제 풀기 본문

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[TestDom] JavaScript 문제 풀기

mingg123 2022. 4. 20. 15:39

1번 

 

function removeProperty(obj, prop) {
  return Object.keys(obj).includes(prop) ? delete obj[prop] : false;
}

 

2번 

function setup() {
  const btn = document.getElementsByClassName("remove")
  for(let i = 0; i < btn.length; i++) {
    btn[i].addEventListener('click', function() {
      this.parentNode.remove();
    })
  }
}
setup();
// Example case. 
document.body.innerHTML = `
<div class="image">
  <img src="https://bit.ly/3lmYVna" alt="First">
  <button class="remove">X</button>
</div>
<div class="image">
  <img src="https://bit.ly/3flyaMj" alt="Second">
  <button class="remove">X</button>
</div>`;

setup();

document.getElementsByClassName("remove")[0].click();
console.log(document.body.innerHTML);

 

3번 

-- Write only the SQL statement that solves the problem and nothing else
SELECT count(*) as 수
from students
where firstName ='John'

 

4번

 

-- Write only the SQL statement that solves the problem and nothing else
UPDATE enrollments SET year = '2015' where ID BETWEEN 20 AND 100

 

 

 

 

 

/**
 * @param {number[]} numbers The array of numbers.
 * @param {number} sum The required target sum.
 * @return {number[]} An array of 2 indices. The indices of the two elements whose sum is equal to sum.
 */
function findTwoSum(numbers, sum) {
  // Your code goes here
   const map = {};

  for (let i = 0; i < sum.length; i++) {
    const another = target - numbers[i];

    if (another in map) {
      return [map[another], i];
    }

    map[numbers[i]] = i;
  }
  return null;
}

const indices = findTwoSum([ 3, 1, 5, 7, 5, 9 ], 10);
console.log(indices);

충격적인건 2중 포문 도는걸로하면 테스트케이스 4개중 3개만 맞았다. 로직이 잘못됐나 싶어서 계속 확인했었는데 시간 복잡도가 오래걸려서 FAILD 였던것 ..

 

5번

 

function ensure(value) {
   if(value === undefined) {
      throw new Error('Error');
   }
  return value
}

try {
  console.log(ensure());
} catch(err) {
  console.log(err);
}

 

 

6번

 

function createCheckDigit(membershipId) {
  let token = aggregator(membershipId);

  while(parseInt(token) > 9) {
    token = aggregator(token);
  }
  return token;
}

function aggregator(strId) {
  return strId.toString().split('').reduce((a,b)=> parseInt(a)+ parseInt(b), 0);
}
console.log(createCheckDigit("55555"));

 

 

 

7번 

 

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Styling links</title>
    <style type="text/css">
       a {
        cursor: help;
        text-decoration: none;
        text-transform: uppercase;
        color: lavender;
      }
      a:before {
        content: ">";
      }
      a:after {
        content: "<";
      }
    </style>
  </head>
  <body>
    <a href="http://www.testdome.com">Check documentation</a>
  </body>
</html>

 

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