Array reduce

最新推荐文章于 2025-02-22 16:28:14 发布

Irene-li

最新推荐文章于 2025-02-22 16:28:14 发布

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分类专栏： angularjs 前端文章标签： reduce

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Array.reduce()

MDN Array.prototype.reduce()

按数组中某个值进行分组

let questions = [{
    group: 'group1',
    title: 'question content 1'
}, {
    group: 'group1',
    title: 'question content 2'
}, {
    group: 'group1',
    title: 'question content 3'
}, {
    group: 'group2',
    title: 'question content 3'
}];

let newQuestions = questions.reduce(function (accumulator, currentValue) {
    accumulator[currentValue.group] = accumulator[currentValue.group] || [];
    accumulator[currentValue.group].push(currentValue);
    return accumulator;
}, {});

newQuestions值 输出：
// newQuestions = {
//     group1: [
//         {group: 'group1', title: 'question content 1'},
//         {group: 'group1', title: 'question content 2'},
//         {group: 'group1', title: 'question content 3'}
//     ],
//     group2: [{group: 'group2', title: 'question content 3'}]
// }