如何按键对对象数组进行分组?
如何按对象键对对象数组进行分组,以根据分组创建新的对象数组?
例如,我有一个汽车对象数组:
const array = [
{red: [ {height: 50} ]},
{green: [ {height: 20} ]},
{blue: [ {height: 30} ]},
{blue: [ {height: 40} ]},
{red: [ {height: 10} ]},
{green: [ {height: 60} ]}
]
我要创建一个新的对象数组。(键为颜色)
const result = [
{red: [{height: 50}, {height: 10}]},
{green: [{height: 20}, {height: 60}]},
{blue: [{height: 30}, {height: 40}]}
]
我尝试使用listash.groupBy,但是我根本不知道如何解决此问题。
解决方案
使用数组Reduce可以迭代数据并计算结果对象。
const array = [
{ 'red': [ { height: 50 } ] },
{ 'green': [ { height: 20 } ] },
{ 'blue': [ { height: 30 } ] },
{ 'blue': [ { height: 40 } ] },
{ 'red': [ { height: 10 } ] },
{ 'green': [ { height: 60 } ] }
];
const res = array.reduce((acc, element) => {
// Extract key and height value array
const [key, heightValue] = Object.entries(element)[0];
// Get or create if non-exist, and push height value from array, index 0
(acc[key] || (acc[key] = [])).push(heightValue[0]);
return acc;
}, {});
console.log(res);
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