Benchmark value slice, update function (#261)

benchmarks/value-slice.bench.ts

@@ -0,0 +1,211 @@
+import { describe, bench, it, expect } from "vitest";
+
+const CASES = [
+  {
+    text: "test=example",
+    start: 5,
+    end: 12,
+    expected: "example",
+  },
+  {
+    text: "test=",
+    start: 5,
+    end: 5,
+    expected: "",
+  },
+  {
+    text: "test= example ",
+    start: 5,
+    end: 14,
+    expected: "example",
+  },
+  {
+    text: "test=example ",
+    start: 5,
+    end: 13,
+    expected: "example",
+  },
+  {
+    text: "test= example",
+    start: 5,
+    end: 13,
+    expected: "example",
+  },
+  {
+    text: "test= \t ",
+    start: 5,
+    end: 8,
+    expected: "",
+  },
+];
+
+function valueSliceDoThenWhile(str: string, min: number, max: number) {
+  let start = min;
+  let end = max;
+
+  do {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (++start < end);
+
+  while (end > start) {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    end--;
+  }
+
+  return str.slice(start, end);
+}
+
+function valueSliceDoThenWhileEmptyString(
+  str: string,
+  min: number,
+  max: number,
+) {
+  let start = min;
+  let end = max;
+
+  do {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (++start < end);
+
+  while (end > start) {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    end--;
+  }
+
+  return start === end ? "" : str.slice(start, end);
+}
+
+function valueSliceDoThenWhileExitEarly(str: string, min: number, max: number) {
+  if (min === max) return "";
+  let start = min;
+  let end = max;
+
+  do {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (++start < end);
+
+  while (end > start) {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    end--;
+  }
+
+  return str.slice(start, end);
+}
+
+function valueSliceTwoWhile(str: string, min: number, max: number) {
+  let start = min;
+  let end = max;
+
+  while (start < end) {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    start++;
+  }
+
+  while (end > start) {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    end--;
+  }
+
+  return str.slice(start, end);
+}
+
+function valueSliceTwoWhileExitEarly(str: string, min: number, max: number) {
+  if (min === max) return "";
+  let start = min;
+  let end = max;
+
+  while (start < end) {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    start++;
+  }
+
+  while (end > start) {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+    end--;
+  }
+
+  return str.slice(start, end);
+}
+
+function valueSliceTwoDoWhile(str: string, min: number, max: number) {
+  let start = min;
+  let end = max;
+
+  do {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (++start < end);
+
+  do {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (--end > start);
+
+  return str.slice(start, end);
+}
+
+function valueSliceTwoDoWhileExitEarly(str: string, min: number, max: number) {
+  if (min === max) return "";
+  let start = min;
+  let end = max;
+
+  do {
+    const code = str.charCodeAt(start);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (++start < end);
+
+  do {
+    const code = str.charCodeAt(end - 1);
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
+  } while (--end > start);
+
+  return str.slice(start, end);
+}
+
+function valueSliceThenTrim(str: string, min: number, max: number) {
+  return str.slice(min, max).trim();
+}
+
+describe.each(CASES)("valueSlice $text", ({ text, start, end, expected }) => {
+  bench("two while", () => {
+    valueSliceTwoWhile(text, start, end);
+  });
+
+  bench("two while (exit early)", () => {
+    valueSliceTwoWhileExitEarly(text, start, end);
+  });
+
+  bench("two do...while", () => {
+    valueSliceTwoDoWhile(text, start, end);
+  });
+
+  bench("two do...while (exit early)", () => {
+    valueSliceTwoDoWhileExitEarly(text, start, end);
+  });
+
+  bench("do...while then while", () => {
+    valueSliceDoThenWhile(text, start, end);
+  });
+
+  bench("do...while then while (exit early)", () => {
+    valueSliceDoThenWhileExitEarly(text, start, end);
+  });
+
+  bench("do...while then while (empty string check)", () => {
+    valueSliceDoThenWhileEmptyString(text, start, end);
+  });
+
+  bench("slice then trim", () => {
+    valueSliceThenTrim(text, start, end);
+  });
+});

package-lock.json

@@ -10,7 +10,9 @@
       "license": "MIT",
       "devDependencies": {
         "@borderless/ts-scripts": "^0.15.0",
+        "@size-limit/preset-small-lib": "^12.0.0",
         "@vitest/coverage-v8": "^3.2.4",
+        "size-limit": "^12.0.0",
         "top-sites": "1.1.194",
         "typescript": "^5.6.2",
         "vitest": "^3.2.4"
@@ -1298,6 +1300,554 @@
         "url": "https://github.com/sindresorhus/is?sponsor=1"
       }
     },
+    "node_modules/@size-limit/esbuild": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@size-limit/esbuild/-/esbuild-12.0.0.tgz",
+      "integrity": "sha512-r9i+HrtunIu7wAPtqD3t4DqfYin3kxPoMAv8cidkzlCS69IYCe3EG2UbQa10AdvQyaHTEK+MPkr9ifUd3W29og==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.27.0",
+        "nanoid": "^5.1.6"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "size-limit": "12.0.0"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.2.tgz",
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+      "license": "MIT",
+      "optional": true,
+      "os": [
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+      "engines": {
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+      }
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+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/android-arm": {
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+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.2.tgz",
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+        "arm"
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+      ],
+      "engines": {
+        "node": ">=18"
+      }
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+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/android-arm64": {
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+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.2.tgz",
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+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/openharmony-arm64/-/openharmony-arm64-0.27.2.tgz",
+      "integrity": "sha512-LRBbCmiU51IXfeXk59csuX/aSaToeG7w48nMwA6049Y4J4+VbWALAuXcs+qcD04rHDuSCSRKdmY63sruDS5qag==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openharmony"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/sunos-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.27.2.tgz",
+      "integrity": "sha512-kMtx1yqJHTmqaqHPAzKCAkDaKsffmXkPHThSfRwZGyuqyIeBvf08KSsYXl+abf5HDAPMJIPnbBfXvP2ZC2TfHg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/win32-arm64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.27.2.tgz",
+      "integrity": "sha512-Yaf78O/B3Kkh+nKABUF++bvJv5Ijoy9AN1ww904rOXZFLWVc5OLOfL56W+C8F9xn5JQZa3UX6m+IktJnIb1Jjg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/win32-ia32": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.27.2.tgz",
+      "integrity": "sha512-Iuws0kxo4yusk7sw70Xa2E2imZU5HoixzxfGCdxwBdhiDgt9vX9VUCBhqcwY7/uh//78A1hMkkROMJq9l27oLQ==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/@esbuild/win32-x64": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.27.2.tgz",
+      "integrity": "sha512-sRdU18mcKf7F+YgheI/zGf5alZatMUTKj/jNS6l744f9u3WFu4v7twcUI9vu4mknF4Y9aDlblIie0IM+5xxaqQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/esbuild": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.27.2.tgz",
+      "integrity": "sha512-HyNQImnsOC7X9PMNaCIeAm4ISCQXs5a5YasTXVliKv4uuBo1dKrG0A+uQS8M5eXjVMnLg3WgXaKvprHlFJQffw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "esbuild": "bin/esbuild"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "@esbuild/aix-ppc64": "0.27.2",
+        "@esbuild/android-arm": "0.27.2",
+        "@esbuild/android-arm64": "0.27.2",
+        "@esbuild/android-x64": "0.27.2",
+        "@esbuild/darwin-arm64": "0.27.2",
+        "@esbuild/darwin-x64": "0.27.2",
+        "@esbuild/freebsd-arm64": "0.27.2",
+        "@esbuild/freebsd-x64": "0.27.2",
+        "@esbuild/linux-arm": "0.27.2",
+        "@esbuild/linux-arm64": "0.27.2",
+        "@esbuild/linux-ia32": "0.27.2",
+        "@esbuild/linux-loong64": "0.27.2",
+        "@esbuild/linux-mips64el": "0.27.2",
+        "@esbuild/linux-ppc64": "0.27.2",
+        "@esbuild/linux-riscv64": "0.27.2",
+        "@esbuild/linux-s390x": "0.27.2",
+        "@esbuild/linux-x64": "0.27.2",
+        "@esbuild/netbsd-arm64": "0.27.2",
+        "@esbuild/netbsd-x64": "0.27.2",
+        "@esbuild/openbsd-arm64": "0.27.2",
+        "@esbuild/openbsd-x64": "0.27.2",
+        "@esbuild/openharmony-arm64": "0.27.2",
+        "@esbuild/sunos-x64": "0.27.2",
+        "@esbuild/win32-arm64": "0.27.2",
+        "@esbuild/win32-ia32": "0.27.2",
+        "@esbuild/win32-x64": "0.27.2"
+      }
+    },
+    "node_modules/@size-limit/esbuild/node_modules/nanoid": {
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-5.1.6.tgz",
+      "integrity": "sha512-c7+7RQ+dMB5dPwwCp4ee1/iV/q2P6aK1mTZcfr1BTuVlyW9hJYiMPybJCcnBlQtuSmTIWNeazm/zqNoZSSElBg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "bin": {
+        "nanoid": "bin/nanoid.js"
+      },
+      "engines": {
+        "node": "^18 || >=20"
+      }
+    },
+    "node_modules/@size-limit/file": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@size-limit/file/-/file-12.0.0.tgz",
+      "integrity": "sha512-OzKYpDzWJ2jo6cAIzVsaPuvzZTmMLDoVCViEvsctmImxpXzwJZcuBEpPohFKKdgVdZuNTU8WstmvywPq55Njdw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "size-limit": "12.0.0"
+      }
+    },
+    "node_modules/@size-limit/preset-small-lib": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@size-limit/preset-small-lib/-/preset-small-lib-12.0.0.tgz",
+      "integrity": "sha512-HHHVQjZmj+8vg7qsHs1dd3Hmn8ygUsE5O2CfxnbCbHOGyUw7VodZGERh/+5ogVrF2DYza/DIo2PnCJZZETdTRA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@size-limit/esbuild": "12.0.0",
+        "@size-limit/file": "12.0.0",
+        "size-limit": "12.0.0"
+      },
+      "peerDependencies": {
+        "size-limit": "12.0.0"
+      }
+    },
     "node_modules/@szmarczak/http-timer": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-4.0.6.tgz",
@@ -1772,6 +2322,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/bytes-iec": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/bytes-iec/-/bytes-iec-3.1.1.tgz",
+      "integrity": "sha512-fey6+4jDK7TFtFg/klGSvNKJctyU7n2aQdnM+CO0ruLPbqqMOM8Tio0Pc+deqUeVKX1tL5DQep1zQ7+37aTAsA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/cac": {
       "version": "6.7.14",
       "resolved": "https://registry.npmjs.org/cac/-/cac-6.7.14.tgz",
@@ -2931,9 +3491,9 @@
       }
     },
     "node_modules/lilconfig": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/lilconfig/-/lilconfig-3.1.2.tgz",
-      "integrity": "sha512-eop+wDAvpItUys0FWkHIKeC9ybYrTGbU41U5K7+bttZZeohvnY7M9dZ5kB21GNWiFT2q1OoPTvncPCgSOVO5ow==",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/lilconfig/-/lilconfig-3.1.3.tgz",
+      "integrity": "sha512-/vlFKAoH5Cgt3Ie+JLhRbwOsCQePABiU3tJ1egGvyQ+33R/vcwM2Zl2QR/LzjsBeItPt3oSVXapn+m4nQDvpzw==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -3403,6 +3963,16 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/nanospinner": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/nanospinner/-/nanospinner-1.2.2.tgz",
+      "integrity": "sha512-Zt/AmG6qRU3e+WnzGGLuMCEAO/dAu45stNbHY223tUxldaDAeE+FxSPsd9Q+j+paejmm0ZbrNVs5Sraqy3dRxA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "picocolors": "^1.1.1"
+      }
+    },
     "node_modules/normalize-url": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/normalize-url/-/normalize-url-6.1.0.tgz",
@@ -4101,6 +4671,34 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/size-limit": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/size-limit/-/size-limit-12.0.0.tgz",
+      "integrity": "sha512-JBG8dioIs0m2kHOhs9jD6E/tZKD08vmbf2bfqj/rJyNWqJxk/ZcakixjhYtsqdbi+AKVbfPkt3g2RRZiKaizYA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bytes-iec": "^3.1.1",
+        "lilconfig": "^3.1.3",
+        "nanospinner": "^1.2.2",
+        "picocolors": "^1.1.1",
+        "tinyglobby": "^0.2.15"
+      },
+      "bin": {
+        "size-limit": "bin.js"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "jiti": "^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "jiti": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/slash": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-4.0.0.tgz",

package.json

@@ -28,12 +28,15 @@
     "format": "ts-scripts format",
     "prepare": "ts-scripts install",
     "prepublishOnly": "npm run build",
+    "size": "size-limit",
     "specs": "ts-scripts specs",
-    "test": "ts-scripts test"
+    "test": "ts-scripts test && npm run size"
   },
   "devDependencies": {
     "@borderless/ts-scripts": "^0.15.0",
+    "@size-limit/preset-small-lib": "^12.0.0",
     "@vitest/coverage-v8": "^3.2.4",
+    "size-limit": "^12.0.0",
     "top-sites": "1.1.194",
     "typescript": "^5.6.2",
     "vitest": "^3.2.4"
@@ -41,6 +44,12 @@
   "engines": {
     "node": ">=18"
   },
+  "size-limit": [
+    {
+      "path": "dist/index.js",
+      "limit": "1.5 KB"
+    }
+  ],
   "ts-scripts": {
     "project": "tsconfig.build.json"
   }

src/index.ts

@@ -500,17 +500,18 @@ function eqIndex(str: string, min: number, max: number) {
  * Slice out a value between startPod to max.
  */
 function valueSlice(str: string, min: number, max: number) {
+  if (min === max) return "";
   let start = min;
   let end = max;
 
   do {
     const code = str.charCodeAt(start);
-    if (code !== 0x20 /*   */ && code !== 0x09 /* \t */) break;
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
   } while (++start < end);
 
   while (end > start) {
     const code = str.charCodeAt(end - 1);
-    if (code !== 0x20 /*   */ && code !== 0x09 /* \t */) break;
+    if (code !== 32 /*   */ && code !== 9 /* \t */) break;
     end--;
   }
 

src/parse-cookie.spec.ts

@@ -29,6 +29,7 @@ describe("cookie.parseCookie", function () {
 
   it("should return empty object", function () {
     expect(cookie.parseCookie("")).toEqual({});
+    expect(cookie.parseCookie(" \t ")).toEqual({});
   });
 
   it("should parse cookie with empty value", function () {