在 JavaScript 中将 2d 表格数据条目转换为对象数组
javascriptweb developmentfront end technologyobject oriented programming
假设，我们有一个像这样的数组数组 −
const arr = [ ["Ashley","2017-01-10",80], ["Ashley","2017-02-10",75], ["Ashley","2017-03-10",85], ["Clara","2017-01-10",90], ["Clara","2017-02-10",82] ];
我们需要编写一个 JavaScript 函数，将一个这样的数组作为第一个也是唯一的输入。
然后，该函数应根据输入数组构造一个新的对象数组。该数组应包含输入数组的每个唯一子数组的对象。(在此上下文中，唯一是指其第一个元素唯一的子数组)。
每个对象必须具有以下架构 −
const output = [
{"name":"Ashley", "2017-01-10":80, "2017-02-10":75, "2017-03-10":85},
{"name":"Clara", "2017-01-10":90, "2017-02-10":82}
];
示例
const arr = [
["Ashley","2017-01-10",80],
["Ashley","2017-02-10",75],
["Ashley","2017-03-10",85],
["Clara","2017-01-10",90],
["Clara","2017-02-10",82]
];
const groupArray = (arr = []) => {
let grouped = [];
grouped = arr.reduce(function (hash) { return function (r, a) {
if (!hash[a[0]]) {
hash[a[0]] = {
name: a[0] };
r.push(hash[a[0]]);
}
hash[a[0]][a[1]] = a[2];
return r;
};
}
(Object.create(null)), []);
return grouped;
}
console.log(groupArray(arr));
输出
控制台中的输出将是 −
[
{ name: 'Ashley',
'2017-01-10': 80,
'2017-02-10': 75,
'2017-03-10': 85
},
{ name: 'Clara',
'2017-01-10': 90,
'2017-02-10': 82 }
]
