从数组中获取最大和最小日期

Question

我有样本数据:

data = [
  [1, 622, 782, 783, "2015-04-21"],
  [2, 622, 782, 783, "2015-04-21"],
  [3, 622, 782, 783, "2015-04-22"],
  [4, 622, 782, 783, "2015-04-23"],
  [5, 622, 782, 783, "2015-04-24"],
  [6, 622, 782, 783, "2015-04-28"],
  [7, 622, 782, 783, "2015-04-28"],
  [8, 622, 782, 783, "2015-04-29"],
  [9, 622, 782, 783, "2015-05-04"],
  [10, 622, 782, 783, "2015-05-05"]
]

如何从上述数据中获取最大日期值和最小日期值？数据可能不按排序顺序排列.

Answer 1

1)使用map提取dates:

var dates = data.map(function(x) { return new Date(x[4]); })

2)使用Math.max/ Math.min获取最高/最低日期:

var latest = new Date(Math.max.apply(null,dates));
var earliest = new Date(Math.min.apply(null,dates));