merge array of objects concept.
concat() method is used to merge two or more arrays. This method does not change the existing arrays but returns a new array.
This method can also be used to merge arrays of objects.
Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It returns the target object.
Object.assign() does not deep clone. If the source value is a reference to an object, it only copies the reference value. For a deep clone, you need to use other methods, like the Spread operator or Lodash's
The spread operator allows an iterable to expand in places where zero or more arguments or elements are expected. In the case of objects, it copies enumerable own properties from a provided object onto a new object.
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