text: function getImage(filename = "kitten.jpg") {
  	return readFile(filename);
  }
  
  // This function can take any number of arguments.
  // All of them will be placed into an array:
  function sum(...numbers) {
  	let sum = 0;
  
  	for (let number in numbers) {
  		sum += number;
  	}
  
  	return sum;
  }
  
  let result = sum(18, 23, 45);