title: Using a JavaScript file in another JavaScript file
body: <p>I am writing some JavaScript files that will not be used with HTML documents. For example, writing a calculator in one JavaScript file,  where I'll have different <code>.js</code> files say one for addition, subtraction, multiplication, division, etc..</p>
  
  <p>I'd like to have each math operation in a self contained <code>.js</code> file then have another <code>.js</code> file that will #include the other smaller files and can call the functions from them?</p>
  
  <p>Is that possible?</p>