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1. The filter() method filters the elements of an array based on a given function.
2. The function is called for each element of the array and a new array is created which contains the element for which the function returns true.
3. In the above code, the function is filtering the elements of previousArray which don't exist in currentArray.
4. The filter() method returns a new array with the elements that return true.
5. The filter() method doesn't change the original array.
6. The filter() method returns an array.

The filter() method takes two parameters:

function: A function that tests if elements in the array return true or not.
This function must return a Boolean value.
This function is called for each element in the array.
array: An array whose elements will be filtered.
The filter() method returns an array.

The filter() method is called on an array.
It takes a function as its parameter which is called for each element in the array.
The filter() method calls the function for each element in the array and returns a new array containing all the elements for which the function returned true.

The filter() method is called on an array.
It takes a function as its parameter which is called for each element in the array.
The filter() method calls the function for each element in the array and returns a new array containing all the elements for which the function returned true.

The filter() method is called on an array.
It takes a function as its parameter which is called for each element in the array.
The filter() method calls the function for each element in the array and returns a new array containing all the elements for which the function returned true.

The filter() method is called on an array.
It takes a function as its parameter which is called for each element in the array.
The filter() method calls the function for each element in the array and returns a new array containing all the elements for which the function returned true.