Calculate some arithmetic

double.java

class Double {
  
  public double getDouble(value) {
    return 2*value;
  }
  
  public static voind main(args[] string) {
    System.out.println(getDouble(8)); // returns 16
  }
}

square.js

function square(val) {
  const result = val*val;
  return result;
}

console.log(square(5)); // returns 25