sum is not an array, but a function. Because it's called twice on each comparison during sorting, you may end up with some numbers having their sum calculated multiple times.

Why? As I understand it, the sums for each number are only calculated once. During the compare the sum array is only referenced.

take a five, bruh :D

What is sumA === sumB ? Does it means each signle string number equal ？

It is indeficent, it will do the sum several times per each number

I don't like using both declarations and expressions for functions.

The callback you pass into reduce can do everything, including parseInt

oooohhhh very nice. I feel terrible now hahahaha

Love it!

I know it's a while now, but for whoever is also wondering:
I believe it's just a matter of preference using const arrow-functions for one-liners and function for longer functions.

Never knew that reduce works as a int parser, could be one line less for me :-)

Nice one

Wow, talk about leveraging functional programming to the fullest!

Very impressed/confused. Thank you all for the valuable lesson.

Why have sum be a const and then comp be a function? Couldn't they both be constants?