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Modules.md

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LibPQ modules

All modules are grouped into namespaces, much like the standard library:

  • Date - Functions for working with dates
  • Factory - Functions that create other functions
  • Folder - Functions for manupulating folders and their contents
  • Function - Functions that operate on other functions
  • List - Functions for working with lists
  • Module - LibPQ tools for importing source code
  • Read - Functions that import data
  • Table - Functions for table operations
  • Tests - Unit tests for LibPQ modules
  • Text - Functions for working with text
  • UnitTest - Unit testing framework

Date functions

  • Date.IntervalFromText - Given a string of text such as "Jan 2017 - Dec 2017" return a list of two dates corresponding to beginning and end of the interval

  • Date.Parse - Improved date parser for strings containing dates in unspecified format

Factory functions

  • Factory.Comparer - Factory for creating comparison functions from conditions provided as text

Folder functions

  • Folder.Latest - Get the path of the newest subdirectory or file in the given folder. Supports custom sort order and filter functions.

Function functions

  • Function.Chain - Apply a sequence of operations to the input value. Input for each consecutive operation is the output from the previous one.

List functions

  • List.UseLastValid - Validate all items in the input list and replace the invalid ones with the previous valid value.

Module functions

  • Module.BuildPath - Calculate where the function code is located

  • Module.Explore - Find all modules in the list of directories

  • Module.FromPath - Load Power Query function or module from file

  • Module.Import - Import a module from default locations (LibPQPath)

  • Module.ImportAny - Import module (first match) from the list of possible locations

  • Module.Library - A record with all available local modules already imported

  • Module.NameFromProper - Convert proper module name (with dots) into something that follows Power Query naming restrictions for queries in workbook

  • Module.NameToProper - Convert module name to proper filename

Read functions

  • Read.CSV - Load arbitrary CSV file with unknown number of columns (up to 1000) and unknown number of extra lines before the column names (first column name has to be known)

  • Read.Parameter - Fetch parameter value from a data table in current workbook

  • Read.Text - Load text content from local file or from web

Table functions

  • Table.ConcatenateRows - Add all columns from tableB to tableA (with values)

  • Table.CountDuplicates - Add a column to a table that will show the number of rows that contain the same value of key field as the current row.

  • Table.NumberColumns - Transform selected columns' type to number, replace null values with zeros.

  • Table.PromoteHeadersNonEmpty - Promote the first table row as column names, but keep the current header if the value in the first row is empty.

  • Table.UseLastValid - Validate all rows in the input table and replace the invalid ones with the previous valid value.

Unit testing framework

  • UnitTest is a basic unit testing framework built into LibPQ. Read more...