我有2个不同的嵌套对象,我需要知道它们是否在其中一个嵌套属性中有不同。
var a = {};
var b = {};
a.prop1 = 2;
a.prop2 = { prop3: 2 };
b.prop1 = 2;
b.prop2 = { prop3: 3 };
对象可以更复杂,有更多嵌套的属性。但这是一个很好的例子。我可以选择使用递归函数或lodash的东西…
我有2个不同的嵌套对象,我需要知道它们是否在其中一个嵌套属性中有不同。
var a = {};
var b = {};
a.prop1 = 2;
a.prop2 = { prop3: 2 };
b.prop1 = 2;
b.prop2 = { prop3: 3 };
对象可以更复杂,有更多嵌套的属性。但这是一个很好的例子。我可以选择使用递归函数或lodash的东西…
当前回答
要递归地显示一个对象与其他对象的不同之处,可以使用_。Reduce与_结合。isEqual和_.isPlainObject。在这种情况下,你可以比较a与b的不同,或者b与a的不同:
const objectA = { a: { 1: "SAME WILL BE MISSING IN RESULT", 2: "BBB", 3: [1, 2, 3] }, b: "not", c: "foo bar" }; const objectB = { a: { 1: "SAME WILL BE MISSING IN RESULT", 2: [1, 2] }, b: "foo", c: "bar" }; const diff = function(obj1, obj2) { return _.reduce(obj1, function(result, value, key) { if (_.isPlainObject(value)) { result[key] = diff(value, obj2[key]); } else if (!_.isEqual(value, obj2[key])) { result[key] = value; } return result; }, {}); }; const diffAOverB = diff(objectA, objectB); const diffBOverA = diff(objectA, objectB); console.log(diffAOverB); console.log(diffBOverA); <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>
其他回答
要递归地显示一个对象与其他对象的不同之处,可以使用_。Reduce与_结合。isEqual和_.isPlainObject。在这种情况下,你可以比较a与b的不同,或者b与a的不同:
const objectA = { a: { 1: "SAME WILL BE MISSING IN RESULT", 2: "BBB", 3: [1, 2, 3] }, b: "not", c: "foo bar" }; const objectB = { a: { 1: "SAME WILL BE MISSING IN RESULT", 2: [1, 2] }, b: "foo", c: "bar" }; const diff = function(obj1, obj2) { return _.reduce(obj1, function(result, value, key) { if (_.isPlainObject(value)) { result[key] = diff(value, obj2[key]); } else if (!_.isEqual(value, obj2[key])) { result[key] = value; } return result; }, {}); }; const diffAOverB = diff(objectA, objectB); const diffBOverA = diff(objectA, objectB); console.log(diffAOverB); console.log(diffBOverA); <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>
这是我对这个问题的解决办法
const _ = require('lodash');
var objects = [{ 'x': 1, 'y': 2, 'z':3, a:{b:1, c:2, d:{n:0}}, p:[1, 2, 3] }, { 'x': 2, 'y': 1, z:3, a:{b:2, c:2,d:{n:1}}, p:[1,3], m:3 }];
const diffFn=(a,b, path='')=>_.reduce(a, function(result, value, key) {
if(_.isObjectLike(value)){
if(_.isEqual(value, b[key])){
return result;
}else{
return result.concat(diffFn(value, b[key], path?(`${path}.${key}`):key))
}
}else{
return _.isEqual(value, b[key]) ?
result : result.concat(path?(`${path}.${key}`):key);
}
}, []);
const diffKeys1=diffFn(objects[0], objects[1])
const diffKeys2=diffFn(objects[1], objects[0])
const diffKeys=_.union(diffKeys1, diffKeys2)
const res={};
_.forEach(diffKeys, (key)=>_.assign(res, {[key]:{ old: _.get(objects[0], key), new:_.get(objects[1], key)} }))
res
/*
Returns
{
x: { old: 1, new: 2 },
y: { old: 2, new: 1 },
'a.b': { old: 1, new: 2 },
'a.d.n': { old: 0, new: 1 },
'p.1': { old: 2, new: 3 },
'p.2': { old: 3, new: undefined },
m: { old: undefined, new: 3 }
}
*/
如果你只需要键比较:
_.reduce(a, function(result, value, key) {
return b[key] === undefined ? key : []
}, []);
以Sridhar Gudimela的回答为基础,下面以一种使用TypeScript的方式进行了更新:
/// U T I L S
interface LooseObjectInterface {
[key: string]: any;
};
type inputOptions = LooseObjectInterface | any[];
/// E X P O R T
export const objectCompare = (objectA: inputOptions, objectB: inputOptions): LooseObjectInterface => {
let diffObj: LooseObjectInterface = {};
switch(true) {
case (Array.isArray(objectA)):
objectA.forEach((elem: any, index: number) => {
if (!Array.isArray(diffObj))
diffObj = [];
diffObj[index] = objectCompare(elem, (objectB || [])[index]);
});
break;
case (objectA !== null && typeof objectA === "object"):
Object.keys(objectA).forEach((key: any) => {
if (Array.isArray(objectA[key])) {
let arr = objectCompare(objectA[key], objectB[key]);
if (!Array.isArray(arr))
arr = [];
arr.forEach((elem: any, index: number) => {
if (!Array.isArray(diffObj[key]))
diffObj[key] = [];
diffObj[key][index] = elem;
});
} else if (typeof objectA[key] === "object")
diffObj[key] = objectCompare(objectA[key], objectB[key]);
else if (objectA[key] !== (objectB || {})[key])
diffObj[key] = objectA[key];
else if (objectA[key] === (objectB || {})[key])
delete objectA[key];
});
break;
default:
break;
}
Object.keys(diffObj).forEach((key: any) => {
if (typeof diffObj[key] === "object" && JSON.stringify(diffObj[key]) === "{}")
delete diffObj[key];
});
return diffObj;
};
编辑:我最初的回答使用了Flow,因此被否决了(我猜,或者可能是因为我的回答没有使用Lodash……)然而,有一个类似问题的答案也无妨)。
这是一个简单的带有Lodash深度差异检查器的Typescript,它将生成一个新对象,只包含旧对象和新对象之间的差异。
例如,如果我们有:
const oldData = {a: 1, b: 2};
const newData = {a: 1, b: 3};
结果对象将是:
const result: {b: 3};
它还兼容多层深层对象,对于数组,它可能需要一些调整。
import * as _ from "lodash";
export const objectDeepDiff = (data: object | any, oldData: object | any) => {
const record: any = {};
Object.keys(data).forEach((key: string) => {
// Checks that isn't an object and isn't equal
if (!(typeof data[key] === "object" && _.isEqual(data[key], oldData[key]))) {
record[key] = data[key];
}
// If is an object, and the object isn't equal
if ((typeof data[key] === "object" && !_.isEqual(data[key], oldData[key]))) {
record[key] = objectDeepDiff(data[key], oldData[key]);
}
});
return record;
};