Merging two javascript objects into one?

This question already has an answer here:

How can I merge properties of two JavaScript objects dynamically? 55 answers

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Here's a function that's a bit more generic. It propagates through the object and will merge into a declared variable.

const posts = {  '2018-05-11': {    posts: 2  },  '2018-05-12': {    posts: 5  }};
const notes = {  '2018-05-11': {    notes: 1  },  '2018-05-12': {    notes: 3  }};

function objCombine(obj, variable) {
  for (let key of Object.keys(obj)) {
    if (!variable[key]) variable[key] = {};

    for (let innerKey of Object.keys(obj[key]))
      variable[key][innerKey] = obj[key][innerKey];
  }
}

let combined = {};
objCombine(posts, combined);
objCombine(notes, combined);
console.log(combined)

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另一种方法是使用可在支持ES6或ES2015的浏览器上使用的扩展语法

const posts = {'2018-05-11' : {posts: 2}}
const notes = {'2018-05-11' : {notes: 1}}

let result = { ...posts , ...notes }

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var x =  {posts: 2};
var y = {notes: 1};
var z = Object.assign( {}, x, y );
console.log(z);

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