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.. _extended_fns:
Extended function semantics
===================================
Many of funcy functions expecting predicate or mapping function as an argument can take something uncallable instead of it with semantics described in this table:
============ ================================= =================================
f passed Function Predicate
============ ================================= =================================
``None`` :func:`identity <identity>` bool
string :func:`re_finder(f) <re_finder>` :func:`re_tester(f) <re_tester>`
int or slice ``itemgetter(f)`` ``itemgetter(f)``
mapping ``lambda x: f[x]`` ``lambda x: f[x]``
set ``lambda x: x in f`` ``lambda x: x in f``
============ ================================= =================================
Supporting functions
--------------------
Here is a full list of functions supporting extended function semantics:
========================= ==============================================================
Group Functions
========================= ==============================================================
Sequence transformation :func:`map` :func:`keep` :func:`mapcat`
Sequence filtering :func:`filter` :func:`remove` :func:`distinct`
Sequence splitting :func:`dropwhile` :func:`takewhile` :func:`split` :func:`split_by` :func:`partition_by`
Aggregration :func:`group_by` :func:`count_by` :func:`group_by_keys`
Collection transformation :func:`walk` :func:`walk_keys` :func:`walk_values`
Collection filtering :func:`select` :func:`select_keys` :func:`select_values`
Content tests :func:`all` :func:`any` :func:`none` :func:`one` :func:`some` :func:`is_distinct`
Function logic :func:`all_fn` :func:`any_fn` :func:`none_fn` :func:`one_fn` :func:`some_fn`
Function tools :func:`iffy` :func:`compose` :func:`rcompose` :func:`complement` :func:`juxt` :func:`all_fn` :func:`any_fn` :func:`none_fn` :func:`one_fn` :func:`some_fn`
========================= ==============================================================
List or iterator versions of same functions not listed here for brevity but also support extended semantics.
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:file: descriptions.html
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