isNull function

Syntax

bool   isNull(value)

bool[] isNull(values)

Parameters

• value (float, string)
• values (float[], string[])

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]

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