Function is_none

core/src/stdlib/pyscript/ffi.py:102–125

Check if a value is `None` or JavaScript `null`. In Pyodide, JavaScript `null` is represented by the `jsnull` object, so we check for both Python `None` and `jsnull`. This function ensures consistent behavior across Pyodide and MicroPython for null-like values. ```python

(value)

def is_none(value):
    """
    Check if a value is `None` or JavaScript `null`.

    In Pyodide, JavaScript `null` is represented by the `jsnull` object,
    so we check for both Python `None` and `jsnull`. This function ensures
    consistent behavior across Pyodide and MicroPython for null-like
    values.

    ```python
    from pyscript import ffi
    import js


    val1 = None
    val2 = js.null
    val3 = 42

    print(ffi.is_none(val1))  # True
    print(ffi.is_none(val2))  # True
    print(ffi.is_none(val3))  # False
    ```
    """
    return value is None or value is jsnull


try: