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snippets/js/s/sdbm.md

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+---
+title: Hash string into number
+type: snippet
+language: javascript
+tags: [math]
+cover: dark-leaves
+dateModified: 2020-10-22T20:24:30+03:00
+---
+
+Hashes the input string into a whole number.
+
+- Use `String.prototype.split()` and `Array.prototype.reduce()` to create a hash of the input string, utilizing bit shifting.
+
+```js
+const sdbm = str => {
+  let arr = str.split('');
+  return arr.reduce(
+    (hashCode, currentVal) =>
+      (hashCode =
+        currentVal.charCodeAt(0) +
+        (hashCode << 6) +
+        (hashCode << 16) -
+        hashCode),
+    0
+  );
+};
+```
+
+```js
+sdbm('name'); // -3521204949
+```