获得两个数组的联合在JavaScript中 [英] Getting a union of two arrays in JavaScript

问题描述

说我有 [34，35，45，48，49] 和的另一个数组[48，55] 。我怎样才能得到一个结果数组 [34，35，45，48，49，55] ？

Say I have an array of [34, 35, 45, 48, 49] and another array of [48, 55]. How can I get a resulting array of [34, 35, 45, 48, 49, 55]?

推荐答案

如果您不需要保持这个顺序，并考虑 45 和45是相同的：

If you don't need to keep the order, and consider 45 and "45" to be the same:

function union_arrays (x, y) {
  var obj = {};
  for (var i = x.length-1; i >= 0; -- i)
     obj[x[i]] = x[i];
  for (var i = y.length-1; i >= 0; -- i)
     obj[y[i]] = y[i];
  var res = []
  for (var k in obj) {
    if (obj.hasOwnProperty(k))  // <-- optional
      res.push(obj[k]);
  }
  return res;
}

alert(union_arrays([34,35,45,48,49], [44,55]));
// shows [49, 48, 45, 35, 34, 55, 44]

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