reduce is not a function inside function definition

[alfupe]

Hi there!

(using "twing": "^5.0.2")

I defined a simple function and getting this error: "An exception has been thrown during the rendering of a template (\"items.reduce is not a function\") in \"/path/to/template.twig\"."

const twing = new TwingEnvironment(loader);
const sumReduce = new TwingFunction(
  'sum',
  function (items) {
    return items.reduce((accumulator, item) => {
      return accumulator + item.value;
    }, 0);
  },
  [{ name: 'items' }],
);
twing.addFunction(sumReduce);

Surprisingly items.reduce is undefined. So I changed to a mutable approach using forEach instead and it works!

const twing = new TwingEnvironment(loader);
const sumReduce = new TwingFunction('sum', function (items) {
  let sum = 0;
  items.forEach((item) => {
    sum += item.value;
  });
  return Promise.resolve(sum);
});
twing.addFunction(sumReduce);

It happens the same way with map, etc. Can we use map, reduce, filter, etc?

Thanks a lot