refactor: memoize

tests/util/util_spec.lua

@@ -0,0 +1,36 @@
+---@module "luassert"
+
+local LazyVim = require("lazyvim.util")
+
+describe("util", function()
+  local t = 0
+  local fn = function(a)
+    t = t + 1
+    return a
+  end
+
+  local m = LazyVim.memoize(fn)
+
+  it("should memoize a function", function()
+    local a = m(1)
+    local b = m(1)
+    local c = m(2)
+    assert.are.equal(a, b)
+    assert.are.equal(a, 1)
+    assert.are.equal(c, 2)
+    assert.are.equal(t, 2)
+    assert.are_not.equal(a, c)
+  end)
+
+  local f1 = LazyVim.memoize(function()
+    return 1
+  end)
+  local f2 = LazyVim.memoize(function()
+    return 2
+  end)
+
+  it("should memoize based on the correct key", function()
+    assert.are.equal(f1(), 1)
+    assert.are.equal(f2(), 2)
+  end)
+end)