There is a common misconception that the “each” method is only for arrays and that the “in” method is only for objects. In reality, both methods can be used for either data type. The key difference is in how each method behaves.
The “each” method iterates through an array or objects one element at a time, invoking a callback function for each element. The callback function can be used to perform some action on each element, such as logging the element to the console or adding it to another array.
The “in” method, on the other hand, simply checks to see if a given property exists in an object. It does not iterate through the object’s elements. This can be useful for determining if an object has a certain property without having to loop through all of its elements.