jQuery.map的坑

jquery-map-pitfall.js

_.map(['foo', 'bar'], function (item, index) {
  return [index, item];
});

['foo', 'bar'].map(function (item, index) {
  return [index, item];
});

$(['foo', 'bar']).map(function (index, item) {
  return [index, item];
});

$.map(['foo', 'bar'], function (item, index) {
  return [index, item];
});

$.map([1, 2, [3, 4], [5, [6, [7, 8]]]], function recurs(n) {
  return n;
});

$.map([1, 2, [3, 4], [5, [6, [7, 8]]]], function recurs(n) {
  return $.isArray(n) ? $.map(n, recurs) : n;
});