overrideExisting
lib.attrsets.overrideExisting
Docs pulled from | This Revision | 10 minutes ago
Override only the attributes that are already present in the old set useful for deep-overriding.
Inputs
old
-
Original attribute set
new
-
Attribute set with attributes to override in
old
.
Type
overrideExisting :: AttrSet -> AttrSet -> AttrSet
Examples
lib.attrsets.overrideExisting
usage example
overrideExisting {} { a = 1; }
=> {}
overrideExisting { b = 2; } { a = 1; }
=> { b = 2; }
overrideExisting { a = 3; b = 2; } { a = 1; }
=> { a = 1; b = 2; }
Noogle detected
Implementation
The following is the current implementation of this function.
overrideExisting = old: new: mapAttrs (name: value: new.${name} or value) old;