isNull function

Syntax

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

Parameters

1. value—float
2. values—float[]

Returns

true if value is set to the internal special float or string value which represent NULL or "missing value"; false otherwise.

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

For an array values a new array is returned containing the result of each element.

Related

• isnan function

Examples

isNull("CityEngine")
# result = false

isNull("\ue000")
# result = true

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

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