df 0.4.0-nullsafety.0

A dataframe for Dart. An abstraction to help manipulating and analysing data

Changelog

0.4.0-nullsafety.0

• Updates df to support null safety
• DataFrame.meanCol and DataMatrix.mean_ now require you to specify how to treat nulls
• DataFrame.sort and DataFrame.sort_ now require you to either specify how to treat nulls or to provide a custom sort function
• All methods that previously accepted or returned dynamic now return Object or Object?

All DataFrame columns have nullable data types. A future update may support non-nullable columns-if you'd like this feature comment and/or thumbs up it's corresponding github issue

0.3.0

Updates to support the quote escaping sections of the CSV standard (see: https://tools.ietf.org/html/rfc4180 sections 2.5-2.7):

• supports using escape quotes to escape commas
• supports using escape quotes to escape double quotes
• supports using escape quotes to escape newlines

BREAKING CHANGE TO THE DF PACKAGE. Here are the breaking changes, with examples:

Double quotes around a field are now consumed
example csv input row: a,"b",c\n
current df output values: {'a', '"b"', 'c'}
df output values after PR: {'a', 'b', 'c'}
An un-escaped double quote or an escaping double quote without a closing escape quote will throw an exception
example csv input row: a,b"c,d\n
current df output: {'a', 'b"c', 'd'}
df output values after PR: FormatException('A field contained an escape...') <- explanatory error message is included
Numeric records accompanied by whitespace will be inferred as Strings with whitespace
example csv input row: a, 1 \n
current df output values: {'a', 1} <--- parsed as int
df output values after PR: {'a', ' 1 '} <---- remains a string

0.2.1

• Improve the tests
• Improve the docs

0.2.0

• Add support for timestamp formats
• Update dependencies

0.1.0

Initial