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76. What is the difference between for...in and Object.keys?

The main difference between for...in and Object.keys() is the type of data they return.

for...in iterates over all enumerable properties of an object, including inherited properties from the prototype chain. It returns the property keys as strings, but also iterates over non-enumerable properties that may not be desired. Therefore, it is recommended to use the hasOwnProperty() method to ensure only the object's own properties are accessed.

Object.keys() returns an array of a given object's own enumerable property keys. It does not iterate over inherited properties and returns only the keys as an array.

In summary, for...in can be used to iterate over all properties of an object, including non-enumerable properties and inherited properties. Object.keys() returns only the keys of an object's own enumerable properties.