202301142044 filter function

Be careful of the return values

Be careful that in some languages, the filter function filters out elements, and on some other cases returns the list of valid values.

Example:
myList = [1,2,3,4,5,6]

Assume that function isEven returns true if a number is even.
const isEven = (num) => num % 2 == 0;

Now, Python List Filter Function will return [2,4,6] whereas the the JS List Filter Function will return [1,3,5]