A function that generates 5 random values ​​in a certain range without repetition. Explain the point?

Question

Programming

Which lines contain a check for a mismatch of already existing values ​​in the array?
I don't understand how indexOf(value) < 0 works. I know that the indexOf object determines the order in the array, but why " < 0 " ?
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Answer 1

If indexOf does not find an element in the array, then it returns -1
. For example, [1,2,3].indexOf(3) will return 2, and [1,2,3].indexOf(4) will return -1

Answer 2

The indexOf() method returns the first index by which the given element can be found in the array, or -1 if there is no such index.

Maybe try a little... think?
A random number is generated, if it is not in the array, then it is added, as indicated by the index -1

Answer 3

Here you read a question in the list, look at its tags... you expect that now you will help a person with a tricky task to apply the Bloom filter... you open it, you spit with relish in disgust... and throw a link in response without going into details...
https://developer.mozilla.org/ru/docs/Web/JavaScri...
and ask Google to unban you from the search engine