JavaScript

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❓ CHALLENGE

const data = [1, 2, 3, 4, 5];

const result = data.flatMap(num => Array(num).fill(num * 2));

console.log(result);

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❓ CHALLENGE

const data = [1, 2, 3, 4, 5];

const result = data.reduce((acc, val) => acc.concat(Array.from({ length: val }, (_, index) => val + index)), []);

console.log(result);

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❓ CHALLENGE

const data = [
  { id: 1, name: 'Alice', skills: ['JavaScript', 'HTML'] },
  { id: 2, name: 'Bob', skills: ['JavaScript', 'CSS'] },
  { id: 3, name: 'Charlie', skills: ['HTML', 'CSS'] },
];

const result = data.reduce((acc, person) => {
  person.skills.forEach(skill => {
    acc[skill] = acc[skill] ? acc[skill] + 1 : 1;
  });
  return acc;
}, {});

console.log(result);

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❓ CHALLENGE

function fetchData() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('Data fetched successfully!');
    }, 1000);
  });
}

async function getResult() {
  const result = await fetchData();
  console.log(result);
}

getResult();

😂

❓ CHALLENGE

function asyncOperation() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('Async operation completed!');
    }, 2000);
  });
}

const asyncOperationWithTimeout = Promise.race([asyncOperation(), new Promise((_, reject) => setTimeout(() => reject('Timeout!'), 1000))]);

asyncOperationWithTimeout
  .then(result => console.log(result))
  .catch(error => console.log(error));

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❓ CHALLENGE

function calculateAsyncSum(numbers) {
  return new Promise(resolve => {
    setTimeout(() => {
      const sum = numbers.reduce((acc, num) => acc + num, 0);
      resolve(sum);
    }, 1000);
  });
}

async function getResult() {
  const data = [1, 2, 3, 4, 5];
  const result = await calculateAsyncSum(data);
  console.log(result);
}

getResult();

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