Working with Arrays, Variables, and Naming Practices - How Do You Get the Length for an Array, and How Can You Create an Empty Array of Fixed Length?

JavaScript
1

Tell us what’s happening:

What will be the output of the following code?

let arr = new Array(3);
console.log(arr);

The answer should be [undefined, undefined, undefined] but isn’t?

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Challenge Information:

Working with Arrays, Variables, and Naming Practices - How Do You Get the Length for an Array, and How Can You Create an Empty Array of Fixed Length?

2

Did you try running that code to check?

3

No. The curriculum says the answer is as such. It’s either the curriculum is wrong, or the answer is wrong.

1 Like
4

IMG_6627
IMG_66271125×799 126 KB

it looks like the lesson is contradicting itself

you should try to run the code when in doubt

I think the sandbox does not show sparse arrays correctly, and the example was added a comment to match that, but it’s not correct

this will need an issue created on github

2 Likes
5

here the issue