use shorthand syntax

Author: cometkim

README.md

@@ -220,7 +220,7 @@ Since [Hermes doesn't support the `Intl.Segmenter` API](https://github.com/faceb
 
 | Name                         | Unicode® | ESM? |   Size    | Size (min) | Size (min+gzip) | Size (min+br) | Size (min+zstd) |
 |------------------------------|----------|------|----------:|-----------:|----------------:|--------------:|----------------:|
-| `unicode-segmenter/grapheme` |   16.0.0 |   ✔️ |    15,625 |     12,166 |           5,044 |         3,752 |           4,724 |
+| `unicode-segmenter/grapheme` |   16.0.0 |   ✔️ |    15,607 |     12,166 |           5,042 |         3,747 |           4,725 |
 | `graphemer`                  |   15.0.0 |   ✖️ ️|   410,435 |     95,104 |          15,752 |        10,660 |          15,911 |
 | `grapheme-splitter`          |   10.0.0 |   ✖️ |   122,252 |     23,680 |           7,852 |         4,841 |           6,750 |
 | `@formatjs/intl-segmenter`*  |   15.0.0 |   ✖️ |   603,285 |    369,560 |          72,218 |        49,416 |          67,975 |
@@ -236,7 +236,7 @@ Since [Hermes doesn't support the `Intl.Segmenter` API](https://github.com/faceb
 
 | Name                         | Bytecode size | Bytecode size (gzip)* |
 |------------------------------|--------------:|----------------------:|
-| `unicode-segmenter/grapheme` |        20,932 |                10,994 |
+| `unicode-segmenter/grapheme` |        20,932 |                10,991 |
 | `graphemer`                  |       133,978 |                31,713 |
 | `grapheme-splitter`          |        63,835 |                19,137 |
 

src/grapheme.js

@@ -60,9 +60,6 @@ export function* graphemeSegments(input) {
   /** Category of codepoint immediately preceding cursor */
   let catBefore = cat(cp, cache);
 
-  /** Beginning category of a segment */
-  let catBegin = catBefore;
-
   /** @type {GraphemeCategoryNum | null} Category of codepoint immediately preceding cursor. */
   let catAfter = null;
 
@@ -81,11 +78,14 @@ export function* graphemeSegments(input) {
   /** InCB=Consonant InCB=Linker x InCB=Consonant */
   let incb = false;
 
+  let index = 0;
+
+  /** Beginning category of a segment */
+  let _catBegin = catBefore;
+
   /** Memoize the beginnig code point a the segment. */
   let _hd = cp;
 
-  let index = 0;
-
   while (true) {
     cursor += cp < 0xFFFF ? 1 : 2;
 
@@ -95,7 +95,7 @@ export function* graphemeSegments(input) {
         index,
         input,
         _hd,
-        _catBegin: catBegin,
+        _catBegin,
         _catEnd: catBefore,
       };
       return;
@@ -139,15 +139,15 @@ export function* graphemeSegments(input) {
         index,
         input,
         _hd,
-        _catBegin: catBegin,
+        _catBegin,
         _catEnd: catBefore,
       };
 
       // flush
-      index = cursor;
       emoji = false;
       incb = false;
-      catBegin = catAfter;
+      index = cursor;
+      _catBegin = catAfter;
       _hd = cp;
     }