如何在javascript中合并、合并或展平多维数组
如何在javascript中合并、合并或展平多维数组
提问于 2018-07-15 05:02:18
我有一个数组，那就是有相应预订的会议室。会议室是重复的，但相应的预订将是不同的，我不希望重复的会议室，并合并每个会议室的所有预订。
This is what I have:
['conference room one', ['reservation 2', 'reservation 1', 'reservation 3']]
['conference room two', ['reservation 7', 'reservation 5', 'reservation 6']]
['conference room two', ['reservation 10', 'reservation 11', 'reservation 12']]
['conference room one', ['reservation 9', 'reservation 8', 'reservation 15']]
['conference room one', ['reservation 17', 'reservation 14', 'reservation 13']]
This is what I want:
['conference room one', ['reservation 2', 'reservation 1', 'reservation 3', 'reservation 9', 'reservation 8', 'reservation 15', 'reservation 17', 'reservation 14', 'reservation 13']]
['conference room two', ['reservation 7', 'reservation 5', 'reservation 6', 'reservation 10', 'reservation 11', 'reservation 12']](删除了这里的一张截图，因为它无关紧要，让人分心)
回答 2
Stack Overflow用户
回答已采纳
发布于 2018-07-15 05:11:40
您可以使用Array.reduce()创建映射并对所有值进行分组，之后只需使用Object.values()获取所有值的数组。
尝试以下操作：
var arr = [['conference room one', ['reservation 2', 'reservation 1', 'reservation 3']],
['conference room two', ['reservation 7', 'reservation 5', 'reservation 6']],
['conference room two', ['reservation 10', 'reservation 11', 'reservation 12']],
['conference room one', ['reservation 9', 'reservation 8', 'reservation 15']],
['conference room one', ['reservation 17', 'reservation 14', 'reservation 13']]];
var result = Object.values(arr.reduce((a,curr)=>{
if(!a[curr[0]]){ // if the room is not present in map than add it.
a[curr[0]] = curr;
} else{ // if room exist than simply concat the reservations array of map and current element
a[curr[0]][1] = a[curr[0]][1].concat(curr[1]);
}
return a;
},{}));
console.log(result);
Stack Overflow用户
发布于 2018-07-15 05:08:16
另一种方法是使用函数reduce对会议及其预订进行分组，并使用函数Object.values提取分组的值。
let array = [['conference room one', ['reservation 2', 'reservation 1', 'reservation 3']],['conference room two', ['reservation 7', 'reservation 5', 'reservation 6']],['conference room two', ['reservation 10', 'reservation 11', 'reservation 12']],['conference room one', ['reservation 9', 'reservation 8', 'reservation 15']],['conference room one', ['reservation 17', 'reservation 14', 'reservation 13']]],
result = Object.values(array.reduce((a, [conference, reservations]) => {
(a[conference] || (a[conference] = [conference, []]))[1].push(...reservations);
return a;
}, {}));
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }
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原文链接：
https://stackoverflow.com/questions/51343354
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