如何在 angular 8 中的对象数组中进行分组
How to do grouping in Array of Objects in angular 8
如何对一组对象进行分组?是否可以在以下情况下使用reduce?
例如:如果同样需要将数据单独附加到一个字段中,我需要将 id 和 name 分组。
[{
data: ["Sriram Krishnan", 1440]
id: "CHARSUR"
name: "CHARSUR"
},
{
data: ["shaleesh ", 2955]
id: "Timesheet"
name: "Timesheet"
},
{
data:["Balachander ", 3720]
id: "CHARSUR"
name: "CHARSUR"
},
{
data: ["Sriram Krishnan", 720]
id: "Aroscop"
name: "Aroscop"
},
{
data: ["Karthik ", 540]
id: "Timesheet"
name: "Timesheet"
},
{
data: ["Shaju Murugan", 420]
id: "CHARSUR"
name: "CHARSUR"
}]
预期结果:
我需要将分组的结果(数据)追加到数组的数组中。
[{
data: [["Sriram Krishnan", 1440],["Balachander ", 3720],["Shaju Murugan", 420]]
id: "CHARSUR"
name: "CHARSUR"
},
{
data: [["shaleesh ", 2955],["Karthik ", 540]]
id: "Timesheet"
name: "Timesheet"
},
{
data: ["Sriram Krishnan", 720]
id: "Aroscop"
name: "Aroscop"
}]
我正在以这种方式形成数据以在 highcharts 饼图中使用。
在您的源数据中,请确保对象字段以逗号分隔:
src = [
{
data: ['Sriram Krishnan', 1440],
id: 'CHARSUR',
name: 'CHARSUR',
},
{
data: ['shaleesh ', 2955],
id: 'Timesheet',
name: 'Timesheet',
},
{
data: ['Balachander ', 3720],
id: 'CHARSUR',
name: 'CHARSUR',
},
{
data: ['Sriram Krishnan', 720],
id: 'Aroscop',
name: 'Aroscop',
},
{
data: ['Karthik ', 540],
id: 'Timesheet',
name: 'Timesheet',
},
{
data: ['Shaju Murugan', 420],
id: 'CHARSUR',
name: 'CHARSUR',
}];
此 JavaScript 代码将产生预期的分组结果:
let dst = [];
function getRecordInDst(srcRecord) {
for (let dstRecord of dst) {
if (dstRecord.id === srcRecord.id) return dstRecord;
}
let newRecord = {id: srcRecord.id, name: srcRecord.name, data: []};
dst.push(newRecord);
return newRecord;
}
for (let record of src) {
getRecordInDst(record).data.push(record.data);
}
如何对一组对象进行分组?是否可以在以下情况下使用reduce?
例如:如果同样需要将数据单独附加到一个字段中,我需要将 id 和 name 分组。
[{
data: ["Sriram Krishnan", 1440]
id: "CHARSUR"
name: "CHARSUR"
},
{
data: ["shaleesh ", 2955]
id: "Timesheet"
name: "Timesheet"
},
{
data:["Balachander ", 3720]
id: "CHARSUR"
name: "CHARSUR"
},
{
data: ["Sriram Krishnan", 720]
id: "Aroscop"
name: "Aroscop"
},
{
data: ["Karthik ", 540]
id: "Timesheet"
name: "Timesheet"
},
{
data: ["Shaju Murugan", 420]
id: "CHARSUR"
name: "CHARSUR"
}]
预期结果: 我需要将分组的结果(数据)追加到数组的数组中。
[{
data: [["Sriram Krishnan", 1440],["Balachander ", 3720],["Shaju Murugan", 420]]
id: "CHARSUR"
name: "CHARSUR"
},
{
data: [["shaleesh ", 2955],["Karthik ", 540]]
id: "Timesheet"
name: "Timesheet"
},
{
data: ["Sriram Krishnan", 720]
id: "Aroscop"
name: "Aroscop"
}]
我正在以这种方式形成数据以在 highcharts 饼图中使用。
在您的源数据中,请确保对象字段以逗号分隔:
src = [
{
data: ['Sriram Krishnan', 1440],
id: 'CHARSUR',
name: 'CHARSUR',
},
{
data: ['shaleesh ', 2955],
id: 'Timesheet',
name: 'Timesheet',
},
{
data: ['Balachander ', 3720],
id: 'CHARSUR',
name: 'CHARSUR',
},
{
data: ['Sriram Krishnan', 720],
id: 'Aroscop',
name: 'Aroscop',
},
{
data: ['Karthik ', 540],
id: 'Timesheet',
name: 'Timesheet',
},
{
data: ['Shaju Murugan', 420],
id: 'CHARSUR',
name: 'CHARSUR',
}];
此 JavaScript 代码将产生预期的分组结果:
let dst = [];
function getRecordInDst(srcRecord) {
for (let dstRecord of dst) {
if (dstRecord.id === srcRecord.id) return dstRecord;
}
let newRecord = {id: srcRecord.id, name: srcRecord.name, data: []};
dst.push(newRecord);
return newRecord;
}
for (let record of src) {
getRecordInDst(record).data.push(record.data);
}