unicorn/no-array-reduce Restriction ​
What it does ​
Disallow Array#reduce() and Array#reduceRight().
Why is this bad? ​
Array#reduce() and Array#reduceRight() usually result in hard-to-read and less performant code. In almost every case, it can be replaced by .map, .filter, or a for-of loop.
It's only somewhat useful in the rare case of summing up numbers, which is allowed by default.
Example ​
javascript
array.reduce(reducer, initialValue);
array.reduceRight(reducer, initialValue);