This community-built FAQ covers the “Array Type Inference” exercise from the lesson “Arrays”.
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FAQs on the exercise Array Type Inference
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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”];
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.
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’, ’ ']