Init. Map does not function and only working on backend at the moment.

node_modules/yeast/index.js

@@ -0,0 +1,68 @@
+'use strict';
+
+var alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')
+  , length = 64
+  , map = {}
+  , seed = 0
+  , i = 0
+  , prev;
+
+/**
+ * Return a string representing the specified number.
+ *
+ * @param {Number} num The number to convert.
+ * @returns {String} The string representation of the number.
+ * @api public
+ */
+function encode(num) {
+  var encoded = '';
+
+  do {
+    encoded = alphabet[num % length] + encoded;
+    num = Math.floor(num / length);
+  } while (num > 0);
+
+  return encoded;
+}
+
+/**
+ * Return the integer value specified by the given string.
+ *
+ * @param {String} str The string to convert.
+ * @returns {Number} The integer value represented by the string.
+ * @api public
+ */
+function decode(str) {
+  var decoded = 0;
+
+  for (i = 0; i < str.length; i++) {
+    decoded = decoded * length + map[str.charAt(i)];
+  }
+
+  return decoded;
+}
+
+/**
+ * Yeast: A tiny growing id generator.
+ *
+ * @returns {String} A unique id.
+ * @api public
+ */
+function yeast() {
+  var now = encode(+new Date());
+
+  if (now !== prev) return seed = 0, prev = now;
+  return now +'.'+ encode(seed++);
+}
+
+//
+// Map each character to its index.
+//
+for (; i < length; i++) map[alphabet[i]] = i;
+
+//
+// Expose the `yeast`, `encode` and `decode` functions.
+//
+yeast.encode = encode;
+yeast.decode = decode;
+module.exports = yeast;