fix(functional): spread function args in _.apply (#770)

2 files changed, 9 insertions, 1 deletions

diff --git a/lua/mason-core/functional/function.lua b/lua/mason-core/functional/function.lua
index 863df28e..59d3af26 100644
--- a/lua/mason-core/functional/function.lua
+++ b/lua/mason-core/functional/function.lua
@@ -107,7 +107,7 @@ end, 2)
 ---@param args V[]
 ---@return R
 _.apply = _.curryN(function(fn, args)
-    return fn(args)
+    return fn(unpack(args))
 end, 2)
 
 ---@generic T, V
diff --git a/tests/mason-core/functional/function_spec.lua b/tests/mason-core/functional/function_spec.lua
index 6b36b53b..9f5189fd 100644
--- a/tests/mason-core/functional/function_spec.lua
+++ b/tests/mason-core/functional/function_spec.lua
@@ -147,6 +147,14 @@ describe("functional: function", function()
         assert.spy(fn).was_called_with(42)
     end)
 
+    it("should apply function", function()
+        local max = spy.new(math.max)
+        local max_fn = _.apply(max)
+        assert.equals(42, max_fn { 1, 2, 3, 4, 5, 6, 7, 8, 9, 42, 10, 8, 4 })
+        assert.spy(max).was_called(1)
+        assert.spy(max).was_called_with(1, 2, 3, 4, 5, 6, 7, 8, 9, 42, 10, 8, 4)
+    end)
+
     it("should apply value to function", function()
         local agent = spy.new()
         _.apply_to("007", agent)