From b9f3e37f237254a6f302ecc135cca75a6c5ecddb Mon Sep 17 00:00:00 2001
From: Matthew Priddin <matthew.priddin@invenialabs.co.uk>
Date: Fri, 3 Feb 2023 17:31:57 +0000
Subject: [PATCH 1/3] Define `empty!(::KeyedVector)`

---
 src/functions.jl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/functions.jl b/src/functions.jl
index e65a97b..3d152a7 100644
--- a/src/functions.jl
+++ b/src/functions.jl
@@ -441,4 +441,9 @@ function Base.filter!(f, a::KeyedVector)
     deleteat!(a, j:lastindex(a))
     return a
 end
-                                                                
+
+function Base.empty!(v::KeyedVector)
+    empty!(axiskeys(v, 1))
+    empty!(v.data)
+    return v
+end

From 75f5f2d69fdd676f602e2724d1cb37aa4699b697 Mon Sep 17 00:00:00 2001
From: Matthew Priddin <matthew.priddin@invenialabs.co.uk>
Date: Fri, 3 Feb 2023 17:32:05 +0000
Subject: [PATCH 2/3] Add tests

---
 test/_functions.jl | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/test/_functions.jl b/test/_functions.jl
index 40548b9..83410bc 100644
--- a/test/_functions.jl
+++ b/test/_functions.jl
@@ -148,7 +148,7 @@ end
 
     @test axiskeys(filter(isodd, V2),1) isa Vector{Int}
     @test dimnames(filter(isodd, V2)) == (:v,)
-    
+
     V4 = wrapdims(rand(1:99, 10), collect(2:11))
     V4c = copy(V4)
     @test filter!(isodd, V4c) === V4c == filter(isodd, V4)
@@ -288,6 +288,17 @@ end
     @test ka == KeyedArray([4, 5, 6.0], a=1:3)
 end
 
+@testset "empty!" begin
+    kv = wrapdims([1, 2, 3, 4, 5, 6.0], a=[:a, :b, :c, :d, :e, :f])
+    @test kv == empty!(kv)
+    @test isempty(kv)
+
+    # make sure array is not in an invalid state if the emtpy for indices fails
+    ka = wrapdims([4, 5, 6.0], a=1:3)
+    @test_throws MethodError empty!(ka)
+    @test ka == KeyedArray([4, 5, 6.0], a=1:3)
+end
+
 @testset "equality" begin
 
     data = parent(parent(M))

From e65d5feaf8f9de50d1177c76acff8d7162e260a6 Mon Sep 17 00:00:00 2001
From: Matthew Priddin <matthew.priddin@invenialabs.co.uk>
Date: Fri, 3 Feb 2023 17:32:15 +0000
Subject: [PATCH 3/3] Bump version

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 3015728..f00e2e5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "AxisKeys"
 uuid = "94b1ba4f-4ee9-5380-92f1-94cde586c3c5"
 license = "MIT"
-version = "0.2.10"
+version = "0.2.11"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"