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一個值在對象數組中重復多少次

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一個值在對象數組中重復多少次

JavaScript

守候你守候我 2023-11-02 21:30:40

我有這個對象數組：const employees = [ {age: 35, name: "David" position: "Front-End"}, {age: 24, name: "Patrick" position: "Back-End"}, {age: 22, name: "Jonathan" position: "Front-End"}, {age: 32, name: "Raphael" position: "Full-Stack"}, {age: 44, name: "Cole" position: "Back-End"}, {age: 28, name: "Michael" position: "Front-End"},]我想得到這樣的結果：const employees = [ {position: "Front-End", count: 3}, {position: "Back-End", count: 2}, {position: "Full-Stack", count: 1},]這與該結果或最相似的結果有何關系？

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繁星淼淼

TA貢獻1775條經驗獲得超11個贊

const employees = [

{ age: 35, name: 'David', position: 'Front-End' },

{ age: 24, name: 'Patrick', position: 'Back-End' },

{ age: 22, name: 'Jonathan', position: 'Front-End' },

{ age: 32, name: 'Raphael', position: 'Full-Stack' },

{ age: 44, name: 'Cole', position: 'Back-End' },

{ age: 28, name: 'Michael', position: 'Front-End' }

];

const obj = employees.reduce((val, cur) => {

val[cur.position] = val[cur.position] ? val[cur.position] + 1 : 1;

return val;

}, {});

const res = Object.keys(obj).map((key) => ({

position: key,

count: obj[key]

}));

console.log(res);

反對回復 2023-11-02

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一個值在對象數組中重復多少次

一個值在對象數組中重復多少次

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