What's going on with the iterate-function (Chapter 4, page103)

[PhilippAubert]

Hello everyone - I have a very simple question about the "pattern" of that recursive iteration.
I understand it's quite powerful - but when trying to work this code, it's throwing an error.

function iterate(index) {
  if (index === tasks.length) {
    return finish;
  }
  const task = tasks[index];
  task(() => iterate(index + 1));
}

function finish() {
  console.log("finished");
}

iterate(0);

I get the error : TypeError: task is not a function

Maybe I'm too noob for this ;D

[PhilippAubert]

ok, so the main thing seems to be this:

  const task = tasks[index];
  task(() => iterate(index + 1));

how can this const become a function one line later?

[mariocasciaro]

It's because tasks must be an array of functions (tasks, in fact). For example:

const tasks = [
  () => {...},
  () => {...}
]

But you can easily adjust the pattern to accept a list of objects and pass them to a function

[PhilippAubert]

Makes sense. I tried to write a very simple array from 1-10 which didn't do the trick.

[PhilippAubert]

Thank you!!!