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我不太清楚如何阐明我在这篇文章的标题中要做的事情，所以如果标题有误导性或者含糊不清，请原谅我。用Javascript处理对象数组
我有一个从oData调用创建的对象数组（这是在SAPUI5应用程序中）。实际的对象有三个以上的键/值对，但为了保持这个例子的简单性，我将这些对删除了。
[{
"note_type_description": "General",
"note_date": "/Date(872850505000)/",
"note_text": "THIS IS A SUBSIDUARY OF THAT."
},
{
"note_type_description": "General",
"note_date": "/Date(873072000000)/",
"note_text": "Say What Now?"
},
{
"note_type_description": "General",
"note_date": "/Date(891388800000)/",
"note_text": "Say Who Now?"
},
{
"note_type_description": "General",
"note_date": "/Date(891993600000)/",
"note_text": "Say When Now?"
},
{
"note_type_description": "Interaction",
"note_date": "/Date(909014400000)/",
"note_text": "Say How Now?"
},
{
"note_type_description": "Interaction",
"note_date": "/Date(906422400000)/",
"note_text": "Say Valentine Now?"
},
{
"note_type_description": "Interaction",
"note_date": "/Date(1485907200000)/",
"note_text": "The latest interaction."
},
{
"note_type_description": "Company Information",
"note_date": "/Date(1477958400000)/",
"note_text": "Some information about Person"
},
{
"note_type_description": "Company Information",
"note_date": "/Date(1483228800000)/",
"note_text": "Are they private or public?"
},
{
"note_type_description": "Company Information",
"note_date": "/Date(1485907200000)/",
"note_text": "Hope this is enough information!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1485993600000)/",
"note_text": "Good!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1487116800000)/",
"note_text": "Better!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1488412800000)/",
"note_text": "Best!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1490918400000)/",
"note_text": "Superb!"
}]
我想通过对象进行迭代，并创建包含两个最新条目（note_date）的每个类型（note_type_description）的，所以我可以呈现的是，在UI对象的一个新的数组。
我对JS有点新，所以我主要是不清楚我用什么数组来完成这个任务。我想这将从Array.map（）开始并从那里开始。任何援助将不胜感激！我会继续阻止这一切，并发布我一路上的更新！
** **更新
我用@Titus的例子，这里是什么样子后位修饰（切换从箭头功能常规功能）：
var oArr = [{
"note_type_description": "General",
"note_date": "/Date(872850505000)/",
"note_text": "THIS IS A SUBSIDUARY OF THAT."
}, {
"note_type_description": "General",
"note_date": "/Date(873072000000)/",
"note_text": "Say What Now?"
}, {
"note_type_description": "General",
"note_date": "/Date(891388800000)/",
"note_text": "Say Who Now?"
}, {
"note_type_description": "General",
"note_date": "/Date(891993600000)/",
"note_text": "Say When Now?"
}, {
"note_type_description": "Interaction",
"note_date": "/Date(909014400000)/",
"note_text": "Say How Now?"
}, {
"note_type_description": "Interaction",
"note_date": "/Date(906422400000)/",
"note_text": "Say Valentine Now?"
}, {
"note_type_description": "Interaction",
"note_date": "/Date(1485907200000)/",
"note_text": "The latest interaction."
}, {
"note_type_description": "Company Information",
"note_date": "/Date(1477958400000)/",
"note_text": "Some information about Person"
}, {
"note_type_description": "Company Information",
"note_date": "/Date(1483228800000)/",
"note_text": "Are they private or public?"
}, {
"note_type_description": "Company Information",
"note_date": "/Date(1485907200000)/",
"note_text": "Hope this is enough information!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1485993600000)/",
"note_text": "Good!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1487116800000)/",
"note_text": "Better!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1488412800000)/",
"note_text": "Best!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1490918400000)/",
"note_text": "Superb!"
}];
var sortedArr = oArr.sort(function(a, b) {
b.note_date.match(/\d+/)[0] - a.note_date.match(/\d+/)[0]
});
var toRender = [];
sortedArr.forEach(function(v) {
if (toRender.filter(function(vv) {
return v.note_type_description == vv.note_type_description
}).length < 2) {
toRender.push(v);
}
});
toRender.forEach(function(oKey) {
console.log(oKey.note_type_description + " | " + oKey.note_text);
});
* ****更新＃2 *****
只是为了完成这一点，并给予而言，这里是我结束了：
_setNotes: function(oResponse) {
if (typeof oResponse.results !== "undefined") {
var aAllNotes = oResponse.results;
var aTruncNotes = [];
var sortedNotes = aAllNotes.sort(function(a, b) {
a = new Date(a.note_date);
b = new Date(b.note_date);
return a>b ? -1 : a<b ? 1 : 0;
});
sortedNotes.forEach(function(v) {
if (aTruncNotes.filter(function(vv) {
return v.note_type_description === vv.note_type_description;
}).length < 2) {
aTruncNotes.push(v);
}
});
}
this.getView().getModel("view").setProperty("/allNotes", aAllNotes);
this.getView().getModel("view").setProperty("/truncNotes", aTruncNotes);
}
现在我可以称之为“truncNotes”对象在我UI5 XML视图，并返回为这样：
[访问/进程（嵌套）对象，数组或JSON]的可能重复（http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json） – Liam
请发布您试过的代码 – user93
您是什么意思最近的条目？此外，什么阻止你使用现有的数组来呈现你的输出，为什么你不能只使用你拥有的数组？ – dave