输入和输出：




JS参考答案：

var data = [
    { a: "A", b: 2, c: 3 },
    { a: "A", b: 4, c: 5 },
    { a: "B", b: 0, c: 0 },
    { a: "B", b: 5, c: 6 }
];

var set = new Set();
for (let index = 0; index < data.length; index++) {
    const element = data[index];
    set.add(element.a);
}

var obj = new Object();
for (let x of set) {
    var child = new Object();
    child.b = new Array();
    child.c = new Array();
    obj[x] = child;
}

for (let x of set) {
    for (let index = 0; index < data.length; index++) {
        const element = data[index];
        if (x === element.a) {
            obj[x].b.push(element.b);
            obj[x].c.push(element.c);
        }
    }
}
console.log(obj);
--
修改:townhope FROM 183.8.89.*
FROM 223.104.68.*