Top javascript interview questions

function removeVowels(str) {
  return str.replace(/[aeiou]/gi, '');
}

function sumArray(arr) {
  return arr.reduce((a, b) => a + b, 0);
}

function reverseString(str) {
  return str.split('').reverse().join('');
}

function removeNullProperties(obj) {
  return Object.fromEntries(
    Object.entries(obj).filter(
      ([key, value]) => value !== null && value !== undefined
    )
  );
}

function toUpperCase(str) {
  return str.toUpperCase();
}

function removeObjectsWithId1(arr) {
  return arr.filter((obj) => obj.id !== 1);
}

function toLowerCase(str) {
  return str.toLowerCase();
}

function convertStringsToUppercase(obj) {
  return Object.fromEntries(
    Object.entries(obj).map(([key, value]) => [
      key,
      typeof value === 'string' ? value.toUpperCase() : value,
    ])
  );
}

function averageArray(arr) {
  return arr.reduce((a, b) => a + b, 0) / arr.length;
}