v42 - added string hash code

Author: djthorpe

js/string.js

@@ -56,3 +56,24 @@ String.prototype.hasPrefix = function (prefix) {
   const hasPrefix = this.indexOf(prefix) === 0;
   return hasPrefix;
 };
+
+/**
+ * @function hashCode
+ * @memberof String
+ * @description Return a hash code for a string.
+ * @returns number
+ */
+String.prototype.hashCode = function () {
+  let hash = 0;
+  let i;
+  let chr;
+  if (this.length === 0) return hash;
+  for (i = 0; i < this.length; i += 1) {
+    chr = this.charCodeAt(i);
+    // eslint-disable-next-line no-bitwise
+    hash = ((hash << 5) - hash) + chr;
+    // eslint-disable-next-line no-bitwise
+    hash |= 0; // Convert to 32bit integer
+  }
+  return Math.abs(hash);
+};

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@djthorpe/js-framework",
-  "version": "0.0.41",
+  "version": "0.0.42",
   "description": "Javascript Framework",
   "main": "dist/index.js",
   "scripts": {