将同一数组中的多个对象合并为一个对象

Question

var arrObj = [{a:1, b:2},{c:3, d:4},{e:5, f:6}];

我怎么能把它合并成一个obj？

//mergedObj = {a:1, b:2, c:3, d:4, e:5, f:6}

Answer 1

你可以Object.assign像这样使用

const arrObj = [{a: 1, b: 2}, {c: 3, d: 4}, {e: 5, f: 6}];

console.log(arrObj.reduce(function(result, current) {
  return Object.assign(result, current);
}, {}));

// If you prefer arrow functions, you can make it a one-liner ;-)
console.log(arrObj.reduce(((r, c) => Object.assign(r, c)), {}));

// Thanks Spen from the comments. You can use the spread operator with assign
console.log(Object.assign({}, ...arrObj));

这个解决方案只是简单地收集了每个对象中的所有键及其值,Array.prototype.reduce最终返回给我们.

这个检查

var resultObject = arrObj.reduce(function(result, currentObject) {
    for(var key in currentObject) {
        if (currentObject.hasOwnProperty(key)) {
            result[key] = currentObject[key];
        }
    }
    return result;
}, {});

console.log(resultObject);
# { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 }

有必要确保我们不在结果中包含所有继承的可枚举属性.

如果您的环境支持result,那么您可以像这样简洁地执行相同操作

if (currentObject.hasOwnProperty(key)) {

Answer 2

您可以使用reduce优雅的解决方案:

arrObj.reduce(function(acc, x) {
    for (var key in x) acc[key] = x[key];
    return acc;
}, {});

有关更多信息,请参阅MDN文档reduce.