How JavaScript merges multiple objects

This article mainly introduces JavaScript how to merge multiple objects, the article is very detailed, has a certain reference value, interested friends must read it!

Merge multiple object

You may need to merge the two objects together and create a better, richer object to use. To do this, you can use the extension operator. (yes, three dots! ).

Consider emp and job respectively

Let emp = {'id':' Jack', 'age': 32,' addr': 'India'}; let job = {' title': 'Software Dev',' location': 'Paris'}; copy the code

Use the extension operator to merge them into

/ / spread operatorlet merged = {... emp,... job}; console.log ('Spread merged', merged); copy the code

There is another way to implement a merge. You can use Object.assign () as follows:

Console.log ('Object assign', Object.assign ({}, emp, job)); copy the code

Output result:

Notice that both the extension operator and Object.assign perform a shallow merge. In a shallow merge, the properties of the first object are overridden by the same property values of the second object.

For deep merging, consider using _ merge in lodash.

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