//an array of numbers

let numberArray = [1, 2, 3, 4, 5];

​

//output the square of each number

let returnValue = numberArray

  .map((num) => num * 2)

  .map((num) => num.toString())

  .map((string) => "$"+string);

​

//view the results

console.log(numberArray);

console.log(returnValue);