Function hasOwnProperty

hasOwnProperty(obj, keys, returnType?): string | boolean
Determines whether an object has a property with the specified name.
Parameters
- obj: object
  The object to check for properties.
- keys: string
  The keys to check for in the object, separated by commas.
- Optional returnType: boolean = false
  Determines the return type of the function. Defaults to false.
Returns string | boolean
- If returnType is true, returns a boolean value indicating whether all keys were found in the object. If returnType is false, returns a string indicating whether all keys were found or which keys were not found.
Example
```
console.log(hasOwnProperty({'a':1, 'b':2, 'c':3}, "a,d"));
// Output: "d not found"
```

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