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All languages I know of _default_ to a radix of 10 though, allowing other radixes where a prefix is added like 0b111010, 0xa7b45fd9, etc.

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

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> 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))

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

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