Fully agree on the random tests, no discussion there.

But I think it's up to the author whether or not to restrict the kata to primitive types or not. If not, how to count unprimitives is the next decision - by constructor, by typeof, or all of 'em as objects. Whichever way, it should be specified ( and that can be as simple as adding "the given array will contain only primitive datatypes" to the description ). But it's a choice. ( Which may affect ranking. )

I thought that might be the case, so thanks for the clarity.

The BigInt primitive is in stage 3/4 of the ECMAScript specification, and not all browsers/engines support it. The latest version of node to support it is 10.4.0 and since this kata doesn't support 10.4.0, the BigInt primitive does not apply.

I'm new to JS, but I did just notice this: There are 7 primitive data types: string, number, bigint, boolean, null, undefined, and symbol.

https://developer.mozilla.org/en-US/docs/Glossary/Primitive

is this valid?

I suggest you check how to write random tests and add them to this kata.

Sorry for the mistakes and thanks for pointing them out. Fixed.

Another typo: primitve

Also, separate the examples in different lines.

you're welcome. also: I believe the expression you're looking for is not "how much" (as in intensity/degree) but rather "how many" (as in quantity/amount)

Fixed, thanks

Symol