start.js

// print a name
function sayHello(name) {
  console.log(`Hallo ${name} (＾▽＾)`)
}

// check if number are odd or even
function oddOrEven(num) {
  if (num % 2 === 0) {
    console.log('Genab')
  } else {
    console.log('Ganjil')
  }
}

// be a calculator
function areaOfCircle(num) {
  console.log(Math.PI * num * num)
}


// program to count the number of vowels in a string
function countVowel(str) { 
    // find the count of vowels
    const count = str.match(/[aeiou]/gi).length;
    // return number of vowels
    console.log(count)
}