I have first object
obj1 = {lastName: "", address1: "Some address"} and second object:
obj2 = {lastName: "Salivan", address1: "1200 Getty Center Dr"} in the result object:
obj3 = {lastName: "Salivan", address1: "Some address"} 
- 2You haven't indicated any way to determine which object to prefer if a given property is in both. Nor have you provided any code that attempts to solve this (which you should always do before posting to Stack Overflow).jarmod– jarmod2021-11-17 15:36:06 +00:00Commented Nov 17, 2021 at 15:36
- Take a look at: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…A Rogue Otaku– A Rogue Otaku2021-11-17 15:38:24 +00:00Commented Nov 17, 2021 at 15:38
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3 Answers
The easiest way for me would be to do the following:
const newObject = { ...obj1, ...obj2, } The thing is, it will override your values! So better not merge two similar objects into one, usually it is used to update values of an object or merge different objects into one.
As @AlexSp3 suggested, you can also:
obj3 = Object.assign(obj1, obj2) For your specific case:
const obj3 = { key1: '', key2: '', } if (!obj1.key1) { obj3.key1 = obj2.key1; } else { obj3.key1 = obj1.key1; } // ... repeat with key2 6 Comments
Sadi Zeynalov
it returns second object
AlexSp3
obj3 = Object.assign(obj1, obj2) does the same work, maybe you can add it to the answer
mike
Of course, your keys get updated to the latest object you pass.....
jarmod
Always difficult to answer a question when you don't know the requirements.
Sadi Zeynalov
its not correct. I need return obj2 value if in obj1 includes empty value
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If the objective is to select the non falsey values...
let obj1 = { lastName: "", address1: "Some address" } let obj2 = { lastName: "Salivan", address1: "1200 Getty Center Dr" } let result = Object.fromEntries( Object.entries(obj1).map(([key, value]) => { return [key, value || obj2[key]] }) ); console.log(result)
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Without overwriting values:
const obj1 = { key1: 1, key2: 2 } const obj2 = { key2: 3, key3: 4 } function mergeObjects(obj0, obj1) { // merge object keys into array const joined = [...Object.keys(obj0), ...Object.keys(obj1)] // remove duplicates const uniqueKeys = [...new Set(joined)] // merge obj0 and obj1 into new Object // obj1 overrides obj0 const newObject = {} uniqueKeys.forEach(key => { if (obj0[key] !== undefined && obj1[key] !== undefined) { newObject[key] = [obj0[key], obj1[key]] } else if (obj0[key] === undefined && obj1[key] !== undefined) { newObject[key] = obj1[key] } else if (obj0[key] !== undefined && obj1[key] === undefined) { newObject[key] = obj0[key] } else { console.log('OBJECT MERGING ERROR') } }) return newObject } console.log(mergeObjects(obj1, obj2))