refactor: switch refactor

src/index.js

@@ -321,18 +321,36 @@ class Dayjs {
     const diff = this - that
     const getMonth = () => Utils.m(this, that)
 
-    let result = {
-      [C.Y]: () => getMonth() / 12,
-      [C.M]: () => getMonth(),
-      [C.Q]: () => getMonth() / 3,
-      [C.W]: () => (diff - zoneDelta) / C.MILLISECONDS_A_WEEK,
-      [C.D]: () => (diff - zoneDelta) / C.MILLISECONDS_A_DAY,
-      [C.H]: () => diff / C.MILLISECONDS_A_HOUR,
-      [C.MIN]: () => diff / C.MILLISECONDS_A_MINUTE,
-      [C.S]: () => diff / C.MILLISECONDS_A_SECOND
-    }[unit] || (() => diff) // milliseconds
-
-    result = result()
+    let result
+    switch (unit) {
+      case C.Y:
+        result = getMonth() / 12
+        break
+      case C.M:
+        result = getMonth()
+        break
+      case C.Q:
+        result = getMonth() / 3
+        break
+      case C.W:
+        result = (diff - zoneDelta) / C.MILLISECONDS_A_WEEK
+        break
+      case C.D:
+        result = (diff - zoneDelta) / C.MILLISECONDS_A_DAY
+        break
+      case C.H:
+        result = diff / C.MILLISECONDS_A_HOUR
+        break
+      case C.MIN:
+        result = diff / C.MILLISECONDS_A_MINUTE
+        break
+      case C.S:
+        result = diff / C.MILLISECONDS_A_SECOND
+        break
+      default:
+        result = diff // milliseconds
+        break
+    }
 
     return float ? result : Utils.a(result)
   }