Reduce always makes me question the performance and order of operations. The most I'll do in Python is like sum(x[1] for x in args) which is map + reduce. A

Reduce always makes me question the performance and order of operations. The most I'll do in Python is like sum(x[1] for x in args) which is map + reduce. And that's only if x[1] is a number. That's about it. No equivalent in JS. Whenever some JS code has map, I'm like why, and rewrite it as a loop. This is also assuming we're talking about regular code and not an actual map-reduce framework like Spark.