filterAttrsRecursive

lib.attrsets.filterAttrsRecursive

Docs pulled from | This Revision | about 1 hour ago

Filter an attribute set recursively by removing all attributes for which the given predicate return false.

Inputs

pred: Predicate taking an attribute name and an attribute value, which returns true to include the attribute, or false to exclude the attribute.
set: The attribute set to filter

Type

filterAttrsRecursive :: (String -> Any -> Bool) -> AttrSet -> AttrSet

Examples

`lib.attrsets.filterAttrsRecursive` usage example

filterAttrsRecursive (n: v: v != null) { foo = { bar = null; }; }
=> { foo = {}; }

Noogle detected

Aliases

lib.filterAttrsRecursive

Implementation

The following is the current implementation of this function.

filterAttrsRecursive =
    pred: set:
    listToAttrs (
      concatMap (
        name:
        let
          v = set.${name};
        in
        if pred name v then
          [
            (nameValuePair name (if isAttrs v then filterAttrsRecursive pred v else v))
          ]
        else
          [ ]
      ) (attrNames set)
    );