[ianjsikes]

> Seems intuitive that if parseInt allows omitting the radix parameter, that it should default to whatever radix a standard integer primitive would default to.

But in this case, the radix is _not_ omitted. The map function passes the index of the current iteration as the second parameter to the function it is passed. It is kinda like this: ``` ['1','7','11'].map((item, index) => parseInt(item, index))

[sixstringtheory]

Thanks for connecting the dots for me, I see it now!