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Legal Studies用類似鍵合併陣列中的物件 JavaScript
假設，我們有以下物件陣列 −
const arr = [
{id: 1, h1: 'Daily tests'},
{id: 2, h1: 'Details'},
{id: 1, h2: 'Daily classes'},
{id: 3, h2: 'Results'},
{id: 2, h3: 'Admissions'},
{id: 1, h4: 'Students'},
{id: 2, h5: 'Alumni'},
{id: 3, h3: 'Appreciations'},
{id: 1, h5: 'Tiny Tots'},
{id: 1, h6: 'Extras'},
];我們必須編寫一個函式，該函式將該陣列轉換為一個數組，其中所有 id 相同的標題 (h1、h2、h3…) 都合併到同一個物件中。因此，讓我們編寫此函式的程式碼 −
示例
const arr = [
{id: 1, h1: 'Daily tests'},
{id: 2, h1: 'Details'},
{id: 1, h2: 'Daily classes'},
{id: 3, h2: 'Results'},
{id: 2, h3: 'Admissions'},
{id: 1, h4: 'Students'},
{id: 2, h5: 'Alumni'},
{id: 3, h3: 'Appreciations'},
{id: 1, h5: 'Tiny Tots'},
{id: 1, h6: 'Extras'},
];
const clubArray = (arr) => {
return arr.reduce((acc, val, ind) => {
const index = acc.findIndex(el => el.id === val.id);
if(index !== -1){
const key = Object.keys(val)[1];
acc[index][key] = val[key];
} else {
acc.push(val);
};
return acc;
}, []);
};
console.log(clubArray(arr));輸出
控制檯中的輸出將為 −
[
{
id: 1,
h1: 'Daily tests',
h2: 'Daily classes',
h4: 'Students',
h5: 'Tiny Tots',
h6: 'Extras'
},
{ id: 2, h1: 'Details', h3: 'Admissions', h5: 'Alumni' },
{ id: 3, h2: 'Results', h3: 'Appreciations' }
]
更新於: 21-Aug-2020
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