Question

假设我有2个JavaScript多维水果数组。

Array 1
-------------
Item, Count
Apple, 1
Apple, 1
Apple, 1
Orange, 1
Orange, 1
Orange, 1

Array 2
--------------
Item, Count
Apple, 1
Orange, 1

我想要一个新数组，其中数组2中的项目将从数组1中删除并一起添加。

Array Result
--------------
Item, Total
Apple, 2
Orange, 2

Answer 1

＆＃13;

var Array1 = [{Apple: 1},{Apple: 1},{Apple: 1},{Orange: 1},{Orange: 1},{Orange: 1}];
var Array2 = [{Apple: 1},{Orange: 1}];

var Result = Array2.reduce(function(res, item) {
    return Object.keys(item).reduce(function(res, key) {
        res[key] = res[key] || 0;
        res[key] -= parseInt(item[key]);
        return res
    }, res);
}, Array1.reduce(function(res, item) {
    return Object.keys(item).reduce(function(res, key) {
        res[key] = res[key] || 0;
        res[key] += parseInt(item[key]);
        return res
    }, res);
}, {}));

var Answer = Object.keys(Result).reduce(function(arr, key) {
    var o = {};
    o[key] = Result[key];
    return arr.push(o) && arr;
}, []);

console.log(Answer);

＆＃13;

或者，如果输入数据采用以下格式

＆＃13;

var Array1 = [['Apple', 1],['Apple', 1],['Apple', 1],['Orange', 1],['Orange', 1],['Orange', 1]];
var Array2 = [['Apple', 1],['Orange', 1]];

var Result = Array2.reduce(function(res, item) {
    var key = item[0], value = item[1];
    res[key] = res[key] || 0;
    res[key] -= parseInt(value);
    return res;
}, Array1.reduce(function(res, item) {
    var key = item[0], value = item[1];
    res[key] = res[key] || 0;
    res[key] += parseInt(value);
    return res;
}, {}));

var Answer = Object.keys(Result).reduce(function(arr, key) {
    return arr.push([key, Result[key]]) && arr;
}, []);

console.log(Answer);

＆＃13;

将2个数组差异化为总数数组

1 个答案: