[英]Create Map to reduce. Javascript
I have a result of "ImputacionData", and with a reduces it I group it with an attribute of the object: 我有一个“ImputacionData”的结果,并且通过减少它我将它与对象的属性组合在一起:
this.imputacionesDatas = data;
this.imputacionesAndAusencias = this.imputacionesDatas.reduce(function (r, a) {
r[a.empleadoId] = r[a.empleadoId] || [];
r[a.empleadoId].push(a);
return r;
}, Object.create(null));
The problem that I do not know how to work with the result, would need to put it in a Map to be able to work with that data on the screen and be able to paint them. 我不知道如何处理结果的问题需要将它放在Map中才能在屏幕上处理这些数据并能够绘制它们。
I do not know how to put the result of the "reduce" in something like: 我不知道如何把“减少”的结果放在:
Map <number, Array <ImputacionData >>;
You could take Object.entries
for getting keys and values in an array. 您可以使用
Object.entries
获取数组中的键和值。
this.imputacionesAndAusencias = Object.entries(this.imputacionesDatas.reduce(function (r, a) {
r[a.empleadoId] = r[a.empleadoId] || [];
r[a.empleadoId].push(a);
return r;
}, Object.create(null)));
If you like to get a Map
, you could take the map as return value. 如果您想获得
Map
,可以将地图作为返回值。
this.imputacionesAndAusencias = this.imputacionesDatas.reduce(function (map, object) {
if (!map.has(object.empleadoId)) {
return map.set(object.empleadoId, [object]);
}
map.get(object.empleadoId).push(object);
return map;
}, new Map);
You can set the accumulator's initial value to new Map()
and then use the Map methods to set its values. 您可以将累加器的初始值设置为
new Map()
,然后使用Map方法设置其值。
const input = [{ empleadoId: 5 }, { empleadoId: 5 }, { empleadoId: 6 }]; const output = input.reduce((map, item) => { const { empleadoId } = item; if (map.has(empleadoId)) map.get(empleadoId).push(item); else map.set(empleadoId, [item]); return map; }, new Map()); console.log(...output);
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