[azangru]

> Almost all of these examples I'd argue would be better suited for something like .map()

Roughly half of his examples take an array and return either a differently-sized array, or a different data structure altogether. I can’t imagine how one could argue for a map in these cases.

[hn_throwaway_99]

Use the right tool for the job. Array to potentially different sized array? Use flatMap (which he implements in his example, albeit not it an optimal way). Array to single object or value? Use reduce.

[noir_lord]

Indeed, reduce is the swiss army knife since you can use it (sometimes when you shouldn't) to implement most of the other methods of map/filter etc.