Count¶
Nulls¶
countNulls
Count the null values in a column.
Positional parameter:
- columnName
String: the name of the column to count nulls in
Named parameter:
- nullValues
List<dynamic>: list of values considered. Default:
[null, "null", "nan", "NULL"]
final int nulls = df.countNulls("speed", nullValues= <dynamic>[null]);
Zeros¶
Count zeros in a column
final int zeros = df.countZeros("speed", zeroValues= <dynamic>[0,"0"]);
The zeroValues
parameter is optional. It is a list of values considered
zeros. Default values: [0]