I did find an issue in your final code which you posted:
When you iterate over the array, you use this conditional here: if (i !== j && num !== nums[i - 1])
This will instantly fail. On the first iteration, i=0, therefore nums[i-1] is immediately OOB.
You can use a proxy in JS to allow negative indices fwiw.
Also, i will never equal j.
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I loved your thorough explanation!
I did find an issue in your final code which you posted:
When you iterate over the array, you use this conditional here:
if (i !== j && num !== nums[i - 1])This will instantly fail. On the first iteration,
i=0, thereforenums[i-1]is immediately OOB.You can use a proxy in JS to allow negative indices fwiw.
Also,
iwill never equalj.