I have a question about the two objects above:
const object1 = { issues: { global: 'a great string!' } };
const object2 = { issues: { cooldown: 'oh well, another message!' } };
For the purpose of my code, I would need to merge everything but keep the hierarchy between the properties. Like this:
Object.assign(object1, object2);
console.log(object1);
// expected output: { issues: { global: 'a great string!', cooldown: 'oh well, another message!' } }
Except that the problem is that the Object.assign() works such that it will overwrite the previous property (here global) to keep only the last property (here cooldown). Like this:
Object.assign(object1, object2);
console.log(object1);
// real output: { issues: { cooldown: 'oh well, another message!' } }
My question is then simple: how do we get the expected result? I guess it's not as simple as a simple Object.assign(), but precisely: how? Knowing that obviously I took here an example and that, in reality, impossible to know in advance which properties will arrive...
Thanking you for help ๐
I think a recursive solution will help for any level of nesting:
const obj1 = { issues: { global: 'a great string!' } };
const obj2 = { issues: { cooldown: 'oh well, another message!' } };
const obj3 = { issues: { global: 'a great string!' } , problems : { name : 'cool' , size : {
medium : 'ok',
small : 'ok'
} } };
const obj4 = { issues: { cooldown: 'oh well, another message!' } , problems : { name : 'cool' , size : {
big : 'not ok',
} } };
const merge = (obj1,obj2) => {
const newObj = {};
for(let key in obj1){
if(typeof obj1[key] !== 'object'){
newObj[key] = obj1[key];
}
else
if(key in obj2){
newObj[key] = merge(obj1[key],obj2[key]);
}
else{
newObj[key] = obj1[key];
}
}
for(let key in obj2){
if(!(key in obj1)){
newObj[key] = obj2[key];
}
}
return newObj;
};
console.log(merge(obj1,obj2));
console.log(merge(obj3,obj4));You check if keys are matching (available in both objects) and based on that add a new key to your new result object.
Note: The above by defaults handle case when the property values are not objects. You can change and add your desired behaviour
i create this function i think it will do the work
const obj1 = { issues: { global: 'a great string!' } };
const obj2 = { issues: { cooldown: 'oh well, another message!' } };
const obj3 = {
issues: { global: 'a great string!' }, problems: {
name: 'cool', size: {
medium: 'ok',
small: 'ok'
}
}
};
const obj4 = {
issues: { cooldown: 'oh well, another message!' }, problems: {
name: 'cool', size: {
big: 'not ok',
}
}
};
const mergeObj = (obj1, obj2) => {
const Obj1Keys = Object.keys(obj1)
const Obj2Keys = Object.keys(obj1)
const allKeys = [...new Set([...Obj1Keys, ...Obj2Keys])]
const newObj = {}
for (let i = 0; i < allKeys.length; i++) {
const key = allKeys[i]
if (typeof obj1[key] === "object" && typeof obj2[key] === "object")
newObj[key] = mergeObj(obj1[key], obj2[key])
}
return Object.assign(obj1, obj2, newObj)
}
console.log(mergeObj(obj3, obj4));