javascript - 可以合并到这个对象中吗？ (javascript)

Question

是否有可能(如果可以的话如何)合并具有相同值的标签，以便一个标签拥有其所有画廊的数组？

例如，从这个开始:

[{
    tag: "Kings",
    galleries: [
        "2016 Kings Draft Night"
    ]
}, {
    tag: "Draft",
    galleries: [
        "2016 Kings Draft Night"
    ]
}, {
    tag: "Kings",
    galleries: [
        "2016-17 Sacramento Kings Uniforms"
    ]
}]

并以此结束:

[{
    tag: "Kings",
    galleries: [
        "2016 Kings Draft Night", "2016-17 Sacramento Kings Uniforms"
    ]
}, {
    tag: "Draft",
    galleries: [
        "2016 Kings Draft Night"
    ]
}]

非常感谢任何帮助。对此感到难过

Answer 1

您可以 filter()至 concat()现有的 tag galleries，同时删除不需要的。

var result = data.filter(function(item) {
  var ref = this[item.tag];
  if(!ref) {
    return (this[item.tag] = item);
  }
  ref.galleries = ref.galleries.concat(item.galleries);
}, {});

var data = [{
  tag: "Kings",
  galleries: [
    "2016 Kings Draft Night"
  ]
}, {
  tag: "Draft",
  galleries: [
    "2016 Kings Draft Night"
  ]
}, {
  tag: "Kings",
  galleries: [
    "2016-17 Sacramento Kings Uniforms"
  ]
}];

var result = data.filter(function(item) {
  var ref = this[item.tag];
  if(!ref) {
    return (this[item.tag] = item);
  }
  ref.galleries = ref.galleries.concat(item.galleries);
}, {});

document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');