Add hashString

AlttiRi · Jul 13, 2024 · 9f90d1d · 9f90d1d
1 parent d5fddae
commit 9f90d1d
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Showing 2 changed files with 18 additions and 1 deletion.
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@alttiri/util-js",
-  "version": "1.12.0-20240713",
+  "version": "1.13.0-20240713",
   "description": "Some util functions for personal use",
   "homepage": "https://github.com/AlttiRi/util-js",
   "keywords": [

diff --git a/src/util.ts b/src/util.ts
@@ -4,3 +4,20 @@ export function isString(value: unknown): value is string {
 export function isAnyString(value: unknown): value is (string | String) {
     return typeof value === "string" || value instanceof String;
 }
+/**
+ * Java's `hashCode` like.
+ * @example
+ * hashString("Lorem Ipsum") === -488052133
+ * hashString("Qwerty") === -1862984904
+ * hashString("A") === 65
+ * hashString("👾👽💀") === -2019372252
+ * @param {string} str
+ * @return {number}
+ */
+export function hashString(str: string): number {
+    let hash = 0;
+    for (let i = 0; i < str.length; i++) {
+        hash = Math.imul(Math.imul(31, hash) + str.charCodeAt(i), 1);
+    }
+    return hash;
+}