Split the values of a given list into two lists, one containing values the predicate function evaluates to truthy, the other one containing the falsy

bifurcateBy.js

const bifurcateBy = (predicate, list) =>
  list.reduce((acc, val, i) => (
    acc[predicate(val, i) ? 0 : 1].push(val), acc), 
    [[], []]
  );
  
bifurcateBy(val => val > 0, [-1, 2, -3, 4]); 
// = [[2, 4], [-1, -3]]