The index and array arguments are optional. The contexObject argument of the filter () method is optional. If you pass the this value, you canreference it by using this keyword inside the callback function. It is important to note that the filter () method does not change the original array.How do you filter an array with callback function?
Internally, the filter () method iterates over each element of the array and pass each element to the callback function. If the callback function returns true, it includes the element in the return array. The filter () method accepts two named arguments: a callback function and an optional object.How to filter a reference array in a class?
If you want to filter a reference array that is not an Object  you will need to use the toArray method which takes an IntFunction to get an array of the original type as the result: Show activity on this post. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research!