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.


you call the .every method on interestingWords (not words), which contains words with length greater then 5 given the filter action you did earlier

but its still a bit of a guess from my side, given i can’t get your code to run without making assumptions. if you call every on words, you should get false indeed



Just want to ask a follow up question concerning this assignment:

the array consists of: [‘unique’, ‘uncanny’, ‘pique’, ‘oxymoron’, ‘guise’];

the assignment asks for content of more then 5 chars.
return word.length > 5

but in the array there are 2 words with 5 chars, seeing the ‘=’ is not included why does it still return ‘true’??

Thanks Maarten


i assume it refers to the result of the every method?

well, we have two arrays now: words and interestingWords, you call the .every method on the interestingWords array, which only contains words with more then 5 characters (courtesy to the filter method)


thanks @stetim94,

I was confused, as it does make a new variable were the new array is saved in. Hence the ‘true’ output as, indeed, the words more than 5 chars are in there…


Thanks !