More specifically, why the 2 parameters in the .sort() function and why does subtracting them
sort them?
const speciesArray =
[ {speciesName:'shark', numTeeth:50},
{speciesName:'dog', numTeeth:42},
{speciesName:'alligator', numTeeth:80},
{speciesName:'human', numTeeth:32}];
const sortSpeciesByTeeth = arr => arr.sort(
(a, b) => {return a.numTeeth - b.numTeeth}
)