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[英]merge array of multiple object result set in single array using javascript
[英]How to merge merge multiple array to single array in javascript
我有多个数组,其中有多种类型的数据,例如:
var student= [{
id : 1,
name : 'name1',
year: 2016,
dist_id: 251,
zone_id: 25106
},
{
id : 1,
name : 'name2',
year: 2018,
dist_id: 252,
zone_id: 25212
},];
var dist= [{
id : 251,
name : 'dist1'
},
{
id : 252,
name : 'dist2'
}];
var zone= [{
id : 25106,
name : 'zone1'
},
{
id : 25212,
name : 'zone2'
}];
我想创建一个将所有数据合并为一个数组的数组,以便数组中的字段如下所示:
var merge = [{
id: 1,
name : 'name1',
year: 2016,
distname : 'dist1',
zonename: 'zone1',
},
{
id: 2,
name : 'name2',
year: 2018,
distname : 'dist2',
zonename: 'zone2',
}];
提前致谢。
您可以为距离和区域拍摄Map
,并将值映射到新对象中。
var student = [{ id: 1, name: 'name1', year: 2016, dist_id: 251, zone_id: 25106 }, { id: 1, name: 'name2', year: 2018, dist_id: 252, zone_id: 25212 }], dist = [{ id: 251, name: 'dist1' }, { id: 252, name: 'dist2' }], zone = [{ id: 25106, name: 'zone1' }, { id: 25212, name: 'zone2' }], distMap = new Map(dist.map(({ id, name: distname }) => [id, { distname }])), zoneMap = new Map(zone.map(({ id, name: zonename }) => [id, { zonename }])), merged = student.map(({ id, name, year, dist_id, zone_id }) => Object.assign( { id, name, year }, distMap.get(dist_id), zoneMap.get(zone_id) )); console.log(merged);
.as-console-wrapper { max-height: 100% !important; top: 0; }
您可以将student
数组map()
到所需的merge
数组,其中,对于每个映射迭代,您将在dist
和zone
数组中搜索分别在dist_id
和zone_id
上匹配的项,并将其name
合并到映射结果中:
var student= [ { id : 1, name : 'name1', year: 2016, dist_id: 251, zone_id: 25106 }, { id : 1, name : 'name2', year: 2018, dist_id: 252, zone_id: 25212 } ]; var dist= [ { id : 251, name : 'dist1' }, { id : 252, name : 'dist2' }]; var zone= [ { id : 25106, name : 'zone1' }, { id : 25212, name : 'zone2' } ]; // Perform a mapping over the student array to aquire merge array in required // format, with required distname/zonename data var merge = student.map((s) => { // Search dist and zone arrays for items that match of dist_id/zone_id // by filtering and mapping these arrays to find distname and zonename // for this student const distname = dist.filter(d => d.id === s.dist_id).map(d => d.name)[0]; const zonename = zone.filter(z => z.id === s.zone_id).map(z => z.name)[0]; return { id : s.id, name : s.name, year : s.year, distname : distname, zonename : zonename } }); console.log('required merge array:', merge)
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