回答編集履歴
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追記
test
CHANGED
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@@ -3,3 +3,53 @@
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たとえばdata1とdata2を集約するとして、data1にdata2のhoursを加算して
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data2を削除する？（表示しない）？
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#追記
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10
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ベタな処理ですが各データのdateもidも文字列なので連結してキーにしてしまえばよいかも
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```javascript
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var data ={
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"data1":{"date":"2016-09-01","id": "ID1","hours":"1"},
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"data2":{"date":"2016-09-01","id": "ID1","hours":"2"},
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"data3":{"date":"2016-09-01","id": "ID2","hours":"3"},
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"data4":{"date":"2016-09-01","id": "ID2","hours":"4"},
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"data5":{"date":"2016-09-02","id": "ID1","hours":"5"},
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"data6":{"date":"2016-09-02","id": "ID2","hours":"6"},
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};
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var tmp={};
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for(key in data){
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var n=data[key]["date"]+":"+data[key]["id"];
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if(typeof tmp[n]=="undefined"){
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tmp[n]=parseInt(data[key]["hours"]);
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}else{
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tmp[n]+=parseInt(data[key]["hours"]);
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}
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}
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for(key in tmp){
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console.log(key+"="+tmp[key]);
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}
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```
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