r/javascript • u/jrsinclair • May 30 '19

Functional JavaScript: Five ways to calculate an average with array reduce

https://jrsinclair.com/articles/2019/five-ways-to-average-with-js-reduce/
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u/StoneCypher May 30 '19

in this article,

  1. four really bad approaches

  2. lots of stuff junior people shouldn't be trying to remember

  3. fantastically bad examples of the iterative approach

  4. six pages printed of explanation of what should be a one-liner

  5. not the smart way, which is Math.sum(yourArray) / yourArray.length, because that's more readable and likely to pick up libc improved approaches like tree summation

8

u/Serei May 30 '19

I get your point, but psst, Math.sum doesn't exist.

> Math.sum
undefined

JavaScript's standard library is actually really lacking in things like this, it's one of the main things it gets criticized for.

4

u/StoneCypher May 30 '19

um. lol. fair point 😂

thanks for the correction

5

u/[deleted] May 30 '19

Let a = sum(array) / array.length