lib.attrsets.filterAttrs

Filter an attribute set 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

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

Examples

filterAttrs (n: v: n == "foo") { foo = 1; bar = 2; }
=> { foo = 1; }

Noogle detected

• lib.filterAttrs

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