isNull function

bool isNull(value)
bool[] isNull(values)

value floatstring

values float[]string[]

Returns true if the value is set to the internal special float or string value representing NULL or "missing value", false otherwise.

For floats, NULL is encoded as nan. For strings, NULL is encoded as "\ue000".

For arrays, returns the element-wise boolean results.

Related

isnanfunction

Examples

isNull("CityEngine")
# result = false

isNull("\ue000")
# result = true

isNull(ln(-1))
# result = true

isNull(["CityEngine", "\ue000"])
# result = [false, true]