core_quick_reference.diviner
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core_quick_reference.diviner
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			@title Core Utilities Quick Reference
			@group util

			Summary of libphutil core utilities.

			= Overview =

			This document provides a brief overview of the libphutil core utilities.

			= Language Capabilities =

			Functions @{function:id}, @{function:head} and @{function:newv} address language
			grammar and implementation limitations.

			You can efficiently merge a vector of arrays with @{function:array_mergev}.

			Functions @{function:head}, @{function:last}, @{function:head_key} and
			@{function:last_key} let you access the first or last elements of an array
			without raising warnings.

			You can combine an array with itself safely with @{function:array_fuse}.

			= Default Value Selection =

			Functions @{function:idx}, @{function:nonempty} and @{function:coalesce} help
			you to select default values when keys or parameters are missing or empty.

			= Array and Object Manipulation =

			Functions @{function:ipull}, @{function:igroup}, @{function:isort} and
			@{function:ifilter} (i stands for index) simplify common data
			manipulations applied to lists of arrays.

			Functions @{function:mpull}, @{function:mgroup}, @{function:msort} and
			@{function:mfilter} (m stands for method) provide the same capabilities
			for lists of objects.

			@{function:array_select_keys} allows you to choose or reorder keys from a
			dictionary.

			= Lunar Phases =

			@{class:PhutilLunarPhase} calculates lunar phases, allowing you to harden an
			application against threats from werewolves, werebears, and other werecreatures.