if first letter is upper case it wouldn't be camelCase it would be PascalCase

My question exactly until I read Chroo79's comment. I initially made a whoel if, if else, else statement to factor in null but I love how short and sweet this is.

Hello dani1995ar,

Yes I agree --> keep coding... :)

• Node 14 should be enabled (Refer this and this for more info)

changed

If you can, try writing it in one line of code.

"Try writing it in readable code" would be a better challenge.

I'm not quite sure that this is a 7 kyu kata, or I'm too bad

man, thank you very much, comming from a (basic understanding of) python background I thought that the expression would only return true or false, this blew my mind.

would't it return true if the length of x = 4 and the length of o = 2? as I understand it

No. Read this: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND

The solutions are simple ... but don't loop everything

Some people are better at math than others. It's just the way of things. You could have used a loop instead. Not so clever but just as efficient

I understand how it works and why it works, but what I'd like to know is how he got to that point? like how'd you end up with the exact formula that does it? could someone perhaps explain what the thought process coul've been for this? thanks.

OMG thank you very much, I know what I have to do now

Yes, you can visualize it like this:

10                   // no pair
10, 5                // no pair adding to 10
10, 5, 2             // no pair adding to 10
10, 5, 2, 3          // no pair adding to 10
10, 5, 2, 3, 7       // a pair adding to 10: 3 + 7, done