Type Conditions

of_type(cls): Check if object is of type

Checks if an element is an instance of the specified class.

Stream.of([1, 3.4, "A", None] \
    .filter(of_type(int)) \
    .for_each(print) # 1

not_of_type(cls: Type): Check if object is not of type

Checks if an element is not an instance of the specified class.

Stream.of([1, 3.4, "A", None] \
   .filter(not_of_type(int)) \
   .for_each(print) # 3.4, "A", None

none(): Check if object is None

Checks if an element is None.

Stream.of([1, None, "Hello", None] \
   .filter(none()) \
   .for_each(print) # None, None

not_none(): Check if object is not None

Checks if an element is not None.

Stream.of([1, None, "Hello", None] \
   .filter(not_none()) \
   .for_each(print) # 1, "Hello"

true(): Check if object is True

Checks if an element is True.

Stream.of([True, False, "Yes", 0] \
   .filter(true()) \
   .for_each(print) # True

not_true(): Check if object is not True

Checks if an element is not True.

Stream.of([True, False, "Yes", 0] \
   .filter(not_true()) \
   .for_each(print) # False, "Yes", 0

false(): Check if object is False

Checks if an element is False.

Stream.of([True, False, "Yes", 0] \
   .filter(false()) \
   .for_each(print) # False

not_false(): Check if object is not False

Checks if an element is not False.

Stream.of([True, False, "Yes", 0] \
   .filter(not_false()) \
   .for_each(print) # True, "Yes", 0

length(x): Check if object has specified length

Checks if an element has the specified length.

Stream.of(["apple", "banana", "cherry", "kiwi"] \
   .filter(length(5)) \
   .for_each(print) # apple

not_length(x): Check if object does not have specified length

Checks if an element does not have the specified length.

Stream.of(["apple", "banana", "cherry", "kiwi"] \
   .filter(not_length(6)) \
   .for_each(print) # apple, kiwi

empty(): Check if object is empty

Checks if an element is empty (e.g., an empty list, string, etc.).

Stream.of([[], "", {}, set(), None, 0] \
    .filter(empty()) \
    .for_each(print) # [], "", {}, set()

not_empty(): Check if object is not empty

Checks if an element is not empty.

Stream.of([[], "", {}, set(), None, 0] \
    .filter(not_empty()) \
    .for_each(print) # None, 0

equal(x): Check if object is equal to the specified value

Checks if an element is equal to the specified value.

Stream.of([1, 2, 3, 4, 5] \
    .filter(equal(3)) \
    .for_each(print) # 3

not_equal(x): Check if object is not equal to the specified value

Checks if an element is not equal to the specified value.

Stream.of([1, 2, 3, 4, 5] \
    .filter(not_equal(3)) \
    .for_each(print) # 1, 2, 4, 5