[jakear]

map passes the index as the second argument to the mapping function, parseInt accepts the second input as the base. So the result is [10 (0 is treated as 10), NaN (base 1 doesn't work), 2 ("10" in base 2 is 2)].

You can try ["10","10","10"].map(console.log) for more info... the third argument is the source array:

   > 10 0 ['10', '10', '10']

   > 10 1 ['10', '10', '10']

   > 10 2 ['10', '10', '10']

[lucas_codes]

Whoops, of course it does!