[英]JavaScript group and transform array of objects by one or two keys using Lodash
如何按Date
分組並轉換以下數據
// PROVIDED INPUT
[
{
"Date": "2021/Dec/01",
"Media category": "Canvas",
"Printed square meters": 244.58
},
{
"Date": "2021/Dec/01",
"Media category": "Film",
"Printed square meters": 152.62
},
{
"Date": "2021/Dec/01",
"Media category": "Heavy paper > 200gsm",
"Printed square meters": 256.02000000000004
},
{
"Date": "2021/Dec/02",
"Media category": "Textile",
"Printed square meters": 144.95999999999998
},
{
"Date": "2021/Dec/02",
"Media category": "Thick film > 200 um",
"Printed square meters": 153.37
},
{
"Date": "2021/Dec/02",
"Media category": "Paper",
"Printed square meters": 217.2
}, ...
]
用 JavaScript 進入這個。 我試圖用 Lodash 的groupBy()
和mergeWith()
來完成這個,但我沒有得到任何地方:
// DESIRED OUTPUT
[
{
"Date": "2021/Dec/01",
"Canvas": 244.58,
"Film": 152.62
"Heavy paper > 200gsm": 256.02000000000004
},
{
"Date": "2021/Dec/02",
"Textile": 144.95999999999998,
"Thick film > 200 um": 153.37
"Paper": 217.2
}, ...
]
此外,是否可以按兩個鍵分組 - 即Date
和Printer id
:
// PROVIDED INPUT
[
{
"Date": "2021/Dec/01",
"Printer id": "700",
"Media category": "Canvas",
"Printed square meters": 244.58
},
{
"Date": "2021/Dec/01",
"Printer id": "700",
"Media category": "Film",
"Printed square meters": 152.62
},
{
"Date": "2021/Dec/01",
"Printer id": "701",
"Media category": "Heavy paper > 200gsm",
"Printed square meters": 256.02000000000004
},
{
"Date": "2021/Dec/01",
"Printer id": "701",
"Media category": "Textile",
"Printed square meters": 144.95999999999998
}, ...
]
// DESIRED OUTPUT
[
{
"Date": "2021/Dec/01",
"Printer id": "700",
"Canvas": 244.58,
"Film": 152.62
},
{
"Date": "2021/Dec/01",
"Printer id": "701",
"Heavy paper > 200gsm": 256.02000000000004,
"Textile": 144.95999999999998
}, ...
我嘗試用這段代碼做第一個,但不知道如何轉換字段:
// What I tried doing
console.log(_(data)
.groupBy('Date')
.map(g => _.mergeWith({}, ...g, (obj, src) =>
_.isArray(obj) ? obj.concat(src) : undefined))
.value());
在提交此之前檢查了許多問題,但沒有一個具有字段轉換。
您可以基於此鍵在Date
和Printer id
和組上創建計算鍵。
const data = [ { "Date": "2021/Dec/01", "Printer id": "700", "Media category": "Canvas", "Printed square meters": 244.58 }, { "Date": "2021/Dec/01", "Printer id": "700", "Media category": "Film", "Printed square meters": 152.62 }, { "Date": "2021/Dec/01", "Printer id": "701", "Media category": "Heavy paper > 200gsm", "Printed square meters": 256.02000000000004 }, { "Date": "2021/Dec/01", "Printer id": "701", "Media category": "Textile", "Printed square meters": 144.95999999999998 }], result = Object.values(data.reduce((r, o) => { let key = o.Date + '-' + o['Printer id']; r[key]??= {Date: o.Date, 'Printer id': o['Printer id']}; r[key][o['Media category']] = (r[key][o['Media category']]?? 0) + o['Printed square meters']; return r; },{})); console.log(result);
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