FAQ: Arrays - Array Type Inference

This community-built FAQ covers the “Array Type Inference” exercise from the lesson “Arrays”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Learn TypeScript

FAQs on the exercise Array Type Inference

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!
You can also find further discussion and get answers to your questions over in #get-help.

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head to #get-help and #community:tips-and-resources. If you are wanting feedback or inspiration for a project, check out #project.

Looking for motivation to keep learning? Join our wider discussions in #community

Learn more about how to use this guide.

Found a bug? Report it online, or post in #community:Codecademy-Bug-Reporting

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

This exercise says that tuples have a fixed length. How can a tuple have a fixed length if you can use the push method to add more elements to it?
let employee: [number, string] = [1, “Steve”];

employee.push(2, “Bill”);

console.log(employee.length); //prints 4


That’s a legit question. I ran the code on https://www.typescriptlang.org/ and it printed 4 to the console. I’d like to know what’s going on too. Have you found the answer yet?

I also had a problem with this exercise:

The instructions for this exercise aren’t sufficiently clear on how to find the solution.

The 2 rules given are:
1- you are not allowed to use the word Array
2 - you are not allowed to use the characters [ and ].
3 - ***Use the .concat() method and your wits to solve the problem.

The problem:
1- There is no clarification or hint that we have to use the dogUp variable provided
2- Using my wits, as advised, there are other ways to create an inferred string[ ] using .concat( ):

For example (and this was my solution):

let myArr = ‘str’.split(’’).concat( )

console.log(myArr) // [‘s’, ‘t’, ‘r’, ’ ']