# Changelog

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## v1.4.4

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Fixing utf8-bom issues. Thanks to @iamweilee.
-   Fixing file path parsing on windows. Thanks to @blockems and @iamweilee
-   Fixing documentation issues. Thanks to @dhorvay and @ThatIsAPseudo

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## v1.4.3

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Switching to core-js 3. Thanks to @kbrown and @Wildhammer. That was a nightmare.

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## v1.4.2

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Fix core-js version in order to avoid errors related to core-js 3 npm support. Thank you to @kbrown and @Wildhammer.

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## v1.4.1

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Fix errors on IE11 thanks to [mbkupfer](https://github.com/mbkupfer) !!
-   It's not necessary to update the version if you use it in nodejs.

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## v1.4.0

**Author**: Guillaume Mousnier

**Type**: Feature

**Changes**:

-   Replacing tape by ava for unit testing.
-   Change docker-compose to use node LTS (10).
-   Drop useless babel dependencies.
-   Replace webpack by rollup (easier to configure).
-   Drop webpack completely
-   Drop support for es3. You can add it by following the guide.
-   Correct a warning about fs module for front-end builds.
-   Remove a circle dependency (dataframe.js -> groupedDataframe.js -> dataframe.js)
-   Add .tail, .head, .slice, .getRow, .setRow methods.
-   A filtered DataFrame with empty rows will now returns its columns.
-   Add .fillMissingValues, dropMissingValues
-   Add a new parameter to sortBy in order to place missing values.
-   Drop rawgit url to a github pages url.

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## v1.3.2

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Correction of bugs related to .reduce on empty or one length array.

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## v1.3.1

**Author**: @rjrivero

**Type**: Hotfix

**Changes**:

-   Correction of a performance regression on groupBy (get in 1.3.0). Thanks to @rjrivero.

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## v1.3.0

**Author**: Guillaume Mousnier, @rjrivero, @martinv13, @Jefftopia

**Type**: Feature

**Changes**:

-   dataframe-js can now be used in TypeScript (typing is automatically generated, but it works). Thanks to @willkara.
-   A new options parameter is available as DataFrame constructor third parameter.
-   You can add new modules to your DataFrame via the DataFrame constructor by using the options `new DataFrame(yourData, yourColumns, {modules: [YourModule]}).
-   Pass Modules directly in DataFrame constructor is no more possible
-   Row index is now available in DataFrame .map, .filter, .chain thanks to @martinv13.
-   DataFrame.dropDuplicates now works on a subset of columns (new parameter), thanks to @martinv13.
-   DataFrame.sortBy can now sort rows by multiple columns thanks to @Jefftopia.
-   DataFrame.groupBy is now faster thanks to @rjrivero.
-   DataFrame can now be created from empty Array without throwing an error.
-   DataFrame column inference during creation is faster.
-   Other minor optimizations.
-   Updating dev dependencies.
-   Adding prettier in dev.

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## v1.2.8

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Resolve stat.max issue with negative values. See [](https://github.com/d3/d3-request/issues/46). Closes #46

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## v1.2.7

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Row.set and Row.delete now changes DataFrame schema. See [](https://github.com/Gmousse/dataframe-js/issues/30)
-   Fixing d3-requests to avoid build error. See [](https://github.com/d3/d3-request/issues/24)

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## v1.2.6

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Removing the file /lib/modules/sql.js (present due to a bug of npm run build).
-   The code doesn't need es7-checktypes anymore.

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## v1.2.5

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Removing checktypes. (https://github.com/Gmousse/dataframe-js/pull/27)
-   Adding some documentation.

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## v1.2.4

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Debugging SQL module in order to handle correctly IN operator.
-   Adding validation on SQL module table names. Spaces, tabs, ... are not valid anymore.
-   Debugging SQL module in order to work properly with column names having spaces...
-   Adding tests on SQL module.
-   Debugging file import (JSON, CSVs) unit tests (promises were bugged in the test).
-   Adding a FileNotFoundError.
-   Wrong file paths or relative paths are now correctly catched and throw an FileNotFoundError.
-   Refactoring file imports.
-   Adding yarn documentation in the README.
-   Adding DataFrame.fromDSV (alias of fromText, to be more precise).
-   Adding DataFrame.fromPSV.
-   Adding DataFrame.fromTSV.
-   Now using d3.format to handle DataFrame.toDSV, DataFrame.toText, DataFrame.toCSV...
-   Adding DataFrame.toDSV (alias of toText, to be more precise).
-   Adding DataFrame.toPSV.
-   Adding DataFrame.toTSV.
-   Adding tests on different file formats.
-   Catching strange behaviour of csv loading in nodejs 0.10.0 and 0.12.0.

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## v1.2.3

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   A critical performance issue related to GroupedDataFrame is now resolved. Related to [#21](https://github.com/Gmousse/dataframe-js/issues/21). **GroupedDataFrame, DataFrame.groupBy, DataFrame.join(s), DataFrame.diff, DataFrame.dropDuplicates are now 10000 x faster** than previously. See below for the detail:
    -   Removing shitty combine function which was the cause of the performance issue.
    -   Adding a Row.hash generating the hash id for a row.
    -   Modifying GroupedDataFrame.\_groupBy to resolve the performance issue.
-   Error messages are now displayed correctly.
-   NoSuchColumnError is now correctly typed (not TypeError) but simply an Error.
-   DataFrame Errors are now exported in the Errors module.
-   Updating es7-checktypes-decorator to 0.2.1 for the same purpose.
-   Better Error handling on missing or wrong parameters.
-   Using custom webpack.optimize.UglifyJsPlugin in webpack.config.js instead of webpack -p.
-   Adding option keep_fnames on uglify (see above) to repair checktypes decorator after minification. Related to [#21](https://github.com/Gmousse/dataframe-js/issues/21) and [#23](https://github.com/Gmousse/dataframe-js/issues/23).
-   Adding check-node-version --node '>= 4' before npm run lint to avoid CI fails on old node versions. Indeed, eslint doesn't support node < 4 anymore.
-   Refactor on npm scripts.

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## v1.2.2

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Bugfix on join methods. They have now a correct behaviour. Thanks to @PaulMest
-   .outerJoin had a wrong behaviour. It would show the difference between dataframes. .outerJoin is now an alias for .fullJoin. The old behaviour can now be found in .diff.
-   Tests on join methods are now splitted into a single file dataframe_join-test.js. In the future, each test will be splitted by category of functions.

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## v1.2.1

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Modify gitbook and link in npm.

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## v1.2.0

**Author**: Guillaume Mousnier.

**Type**: Feature

**Changes**:

-   Adding .pivot().
-   Adding .melt().
-   Better umd code compression.
-   Cleaning the repo.
-   The documentation is now under gitbook.

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## v1.1.5

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Replacing fs writeFile by writeFileSync.

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## v1.1.4

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Contributing.

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## v1.1.3

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Adding code coverage.

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## v1.1.2

**Author**: Guillaume Mousnier. Thanks to @lmeyerov

**Type**: Hotfix

**Changes**:

-   Deleting withespaces removal in DataFrame. [#14](https://github.com/Gmousse/dataframe-js/issues/14).
-   Fixing withespaces bugs in SQL. [#14](https://github.com/Gmousse/dataframe-js/issues/14).
-   Fixing DataFrame.union() bug when columns aren't in the same order.
    [#15](https://github.com/Gmousse/dataframe-js/issues/15).

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## v1.1.1

**Author**: Guillaume Mousnier.

**Type**: Feature

**Changes**:

-   Fixing a doc issue related to [#13](https://github.com/Gmousse/dataframe-js/issues/13).

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## v1.1.0

**Author**: Guillaume Mousnier.

**Type**: Feature

**Changes**:

-   (Optional) Adding a support for .fromCSV, .fromText, .fromJSON to use browser File object.

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## v1.0.2

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Try catching the fs module for browsers.

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## v1.0.0

**Author**: Guillaume Mousnier

**Type**: Major Release

**Changes**:

-   Adding the sql module. Related to the issue [#5](https://github.com/Gmousse/dataframe-js/issues/5).
-   Adding a GroupedDataFrame object (obtained when group by) with aggregates. Related to the issue [#8](https://github.com/Gmousse/dataframe-js/issues/8).
-   DataFrame.groupBy aggregates now returns a DataFrame with an aggregation column. Related to the issue [#8](https://github.com/Gmousse/dataframe-js/issues/8). /!\ Incompatible with older versions.
-   DataFrame.groupBy can be used on multiple columns. ex: df.groupBy('col1', 'col2'). Related to the issues [#4](https://github.com/Gmousse/dataframe-js/issues/4) and [#8](https://github.com/Gmousse/dataframe-js/issues/8).
-   Adding DataFrame.renameAll() to rename each columns of the DataFrame (current .rename()). Related to issue [#12](https://github.com/Gmousse/dataframe-js/issues/12).
-   Changing DataFrame.rename() which now renames only one column (see .renameAll()). Related to issue [#12](https://github.com/Gmousse/dataframe-js/issues/12). /!\ Incompatible with older versions.
-   Changing DataFrame.matrix.isCommutative() which now receives DataFrame as parameter and not an Array, in order to be more consistant with all the API. /!\ Incompatible with older versions.
-   Adding an optional parameter for DataFrame.toArray(), columnName, allowing to return only one column as Array. Related to issue [#11](https://github.com/Gmousse/dataframe-js/issues/11).
-   Adding DataFrame.toCollection(), to return the DataFrame as a collection of dictionnaries (object). Related to issue [#9](https://github.com/Gmousse/dataframe-js/issues/9).
-   Adding an optional parameter to DataFrame.toJSON(asCollection) to build a JSON object containing a collection of Object.
-   Adding DataFrame.stat.sum() in the stat module. Related to issue [#10](https://github.com/Gmousse/dataframe-js/issues/10).
-   Adding static DataFrame.fromCSV(), .fromText() and .fromJSON() method, allowing to create a DataFrame (via a Promise) from files (path or url).
-   Adding DataFrame.dropDuplicates() which removes duplicated rows.
-   DataFrame.randomSplit() is renamed in DataFrame.bisect(). /!\ Incompatible with older versions.
-   Debbugging DataFrame.show(). Related to the issue [#7](https://github.com/Gmousse/dataframe-js/issues/7).
-   Debbugging DataFrame.sortBy(). Now, it returns an error when applied on a mixed type column. Related to the issues [#3](https://github.com/Gmousse/dataframe-js/issues/3) and [#6](https://github.com/Gmousse/dataframe-js/issues/6).
-   Debbugging DataFrame.sortBy() when used with string.
-   DataFrame.distinct() now throw correctly NoSuchColumnError when passing an incorrect columnName.
-   Adding Error messages on Row, DataFrame, GroupedDataFrame and modules...
-   join methods are completely revisited, providing a result near from sql. Moreover you can join on multiple columns.
-   DataFrame.replace() columnNames arguments are now passed as String (for a single column) or in Array (for multiple ones).
-   DataFrame.transpose() has now an optional argument, transposeColumnNames which place columnNames as rowNames.
-   Adding unit tests to cover more cases.
-   Unit tests are now realized on es5 compiled version.
-   Clarifying error messages.
-   Adding `@checktypes` (see [es7-checktypes-decorator](https://github.com/Gmousse/es7-checktypes-decorator)) to handle wrong arguments types.
-   Removing InputTypeError, now replaced by `@checktypes`. /!\ Incompatible with older versions.

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## v0.2.9

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Fixing issue [#2](https://github.com/Gmousse/dataframe-js/issues/2).
-   Defined as first real stable version.

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## v0.2.7

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Updating keywords and presentation.

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## v0.2.6

**Author**: Guillaume Mousnier.

**Type**: Hotfix

**Changes**:

-   Just some docs.

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## v0.2.5

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Correcting commonjs lib.

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## v0.2.4

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Correcting (maybe more an alternative) for babel related static method error.
-   Adding webpack to compile browser version.

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## v0.2.3

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Adding minify version of the compiled code.
-   PR from GuillaumeAmat: https://github.com/Gmousse/dataframe-js/pull/1

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## v0.2.2

**Author**: Guillaume Mousnier

**Type**: Hotfix

**Changes**:

-   Removing jquery in dependencies.

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## v0.2.1

**Author**: Guillaume Mousnier

**Type**: Feature

**Changes**:

-   First functional version.

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## v0.1.0

**Author**: Guillaume Mousnier

**Type**: Feature

**Changes**:

-   Init the repo.

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