--description--

In the export lesson, you learned about the syntax referred to as a <dfn>named export</dfn>. This allowed you to make multiple functions and variables available for use in other files.

There is another export syntax you need to know, known as <dfn>export default</dfn>. Usually you will use this syntax if only one value is being exported from a file. It is also used to create a fallback value for a file or module.

Below are examples using export default:

export default function add(x, y) {
  return x + y;
}

export default function(x, y) {
  return x + y;
}

The first is a named function, and the second is an anonymous function.

Since export default is used to declare a fallback value for a module or file, you can only have one value be a default export in each module or file. Additionally, you cannot use export default with var, let, or const

--instructions--

The following function should be the fallback value for the module. Please add the necessary code to do so.

--hints--

Your code should use an export fallback.

assert(
  __helpers.removeJSComments(code).match(
    /export\s+default\s+function(\s+subtract\s*|\s*)\(\s*x,\s*y\s*\)\s*{/g
  )
);

--seed--

--seed-contents--

function subtract(x, y) {
  return x - y;
}

--solutions--

export default function subtract(x, y) {
  return x - y;
}