nanoid - npm Package Compare versions

Comparing version 0.1.1 to 0.2.0

CHANGELOG.md

 # Change Log
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## 0.2
+* Add `size` argument to `nanoid()`.
+* Improve performance by 50%.
+* Reduce library size by 26% (by Vsevolod Rodionov and Oleg Mokhov).
+
 ## 0.1.1
@@ -5,0 +10,0 @@ * Reduce library size by 5%.

format.js

@@ -0,1 +1,3 @@
+var masks = [15, 31, 63, 127, 255]
+
 /**
@@ -27,11 +29,13 @@ * Secure random string generator with custom alphabet.
 module.exports = function (random, alphabet, size) {
-  var step = Math.ceil(310 / alphabet.length * size)
+  var mask = masks.find(function (i) {
+    return i >= alphabet.length - 1
+  })
+  var step = Math.ceil(1.6 * mask * size / alphabet.length)
 
-  var bytes, byte
   var id = ''
   while (true) {
-    bytes = random(step)
-    for (var i = 0; i < bytes.length; i++) {
-      byte = bytes[i]
-      if (byte < alphabet.length) {
+    var bytes = random(step)
+    for (var i = 0; i < step; i++) {
+      var byte = bytes[i] & mask
+      if (alphabet[byte]) {
         id += alphabet[byte]
@@ -38,0 +42,0 @@ if (id.length === size) return id

index.js

@@ -1,10 +0,15 @@
-var format = require('./format')
 var random = require('./random')
-var url = require('./url')
 
+var url = '_~0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
+
 /**
  * Generate secure URL-friendly unique ID.
  *
- * @return {string} Random string with 22 URL-friendly symbols.
+ * By default, ID will have 22 symbols to have same collisions probability
+ * as UUID v4.
  *
+ * @param {number} [size=22] The number of symbols in ID.
+ *
+ * @return {string} Random string.
+ *
  * @example
@@ -16,4 +21,10 @@ * var nanoid = require('nanoid')
  */
-module.exports = function () {
-  return format(random, url, 22)
+module.exports = function (size) {
+  size = size || 22
+  var id = ''
+  var bytes = random(size)
+  for (var i = 0; i < size; i++) {
+    id += url[bytes[i] & 63]
+  }
+  return id
 }

package.json

 {
   "name": "nanoid",
-  "version": "0.1.1",
+  "version": "0.2.0",
   "description": "A tiny, secure URL-friendly unique string ID generator",
@@ -18,2 +18,4 @@ "keywords": [
   "devDependencies": {
+    "benchmark": "^2.1.4",
+    "chalk": "^2.1.0",
     "docdash": "^0.4.0",
@@ -34,4 +36,7 @@ "eslint": "^4.4.1",
     "lint-staged": "^4.0.3",
+    "microtime": "^2.1.6",
     "pre-commit": "^1.2.2",
-    "size-limit": "^0.8.1",
+    "shortid": "^2.2.8",
+    "size-limit": "^0.8.2",
+    "uuid": "^3.1.0",
     "webpack-dev-server": "^2.7.1",
@@ -61,3 +66,7 @@ "yaspeller-ci": "^0.6.0"
       "path": "index.js",
-      "limit": "246 B"
+      "limit": "181 B"
+    },
+    {
+      "path": "generate.js",
+      "limit": "197 B"
     }
@@ -64,0 +73,0 @@ ],

README.md

@@ -13,3 +13,3 @@ # Nano ID
 
-**Small.** Only 246 bytes (minified and gzipped). No dependencies.
+**Small.** Only 181 bytes (minified and gzipped). No dependencies.
 It uses [Size Limit] to control size.
@@ -67,3 +67,3 @@
 2. Code of Nano ID has 2 times smaller size compare to `uuid/v4` package:
-   246 bytes instead of 435.
+   181 bytes instead of 435.
 
@@ -75,3 +75,3 @@ ## Usage
 The main module uses URL-friendly symbols (`A-Za-z0-9_~`) and returns an ID
-with 22 characters (to have the same uniqueness as UUID v4).
+with 22 characters (to have the same collisions probability as UUID v4).
 
@@ -86,2 +86,9 @@ ```js
 
+If you want to reduce ID length (and increase collisions probability),
+you can pass length as argument:
+
+```js
+nanoid(10) //=> "IRFa~VaY2b"
+```
+
 ### Custom Alphabet or Length
@@ -97,10 +104,4 @@
 
-If you want to use the same URL-friendly symbols and just change the length,
-you can get default alphabet from the `url` module:
+Alphabet must contain less than 256 symbols.
 
-```js
-var url = require('nanoid/url')
-model.id = generate(url, 10) //=> "Uakgb_J5m9"
-```
-
 ### Custom Random Bytes Generator
@@ -125,1 +126,9 @@
 with random numbers.
+
+If you want to use the same URL-friendly symbols with `format`,
+you can get default alphabet from the `url` module:
+
+```js
+var url = require('nanoid/url')
+format(random, url, 10) //=> "93ce_Ltuub"
+```

No alert changes

Improved metrics

Total package byte prevSize

10050

increased by9.56%

Lines of code

119

increased by12.26%

Number of lines in readme file

129

increased by7.5%

Worsened metrics

Dev dependency count

24

increased by26.32%

No dependency changes