The spread operator in JavaScript, represented by ..., allows an iterable (such as an array or string) to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected, or an object expression to be expanded in places where zero or more key-value pairs (for object literals) are expected.
some common uses of the spread operator:
1. Copying an Array
2. Merging Arrays
3. Spreading Elements in Function Calls
4. Copying an Object
5. Merging Objects
6. Adding New Properties to an Object