FAQ: Iterators - Iterator Documentation


This community-built FAQ covers the “Iterator Documentation” exercise from the lesson “Iterators”.

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This exercise can be found in the following Codecademy content:

Web Development

Introduction To JavaScript

FAQs on the exercise Iterator Documentation

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Hi there, could someone tell me, in this line of code:

const interestingWords = words.filter((word) => {return word.length > 5});

what is the function, what is the callback function, what is the method, what are the arguments?
I kind of get it but it makes no sense to me, thanks!


filter is the method used on the array. The callback function is the arrow function – (word) => {return word.length >5} – . This arrow function is passed as an argument to the filter method.


so does the console not mind the extra un-needed parenthesis here? there was only 1 parameter for each but the template made it seem like you needed 2 :wink: i left the extra parenthesis and didn’t throw an error.


if the function has a single parameter, you can leave the parenthesis ( () ) out, its just a shorthand.