Underscore.js 1.7の使い方 Collections編 partition

var r = document.getElementById("r");
var result = _.partition([1, 2, 3, 4, 5], function(num) {
  return num % 2 === 1;
});
// => [[1, 3, 5], [2, 4]]
r.innerHTML = '奇数は' + result[0];
// => 奇数は1, 3, 5