initial commit

.gitignore

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+node_modules

index.js

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+
+/**
+ * Module dependencies.
+ */
+
+var debug = require('debug')('array-index')
+
+/**
+ * Here's a pure JS implementation.
+ * A harmony proxy impl could help.
+ */
+
+var e = module.exports = {}
+
+e.__ensureLength__ = function ensureLength (_length) {
+  var length = _length | 0
+  var cur = e.__length__ | 0
+  var num = length - cur
+  if (num > 0) {
+    var desc = {}
+    debug('creating a descriptor object with %d entries', num)
+    for (var i = cur; i < length; i++) {
+      desc[i] = setup(i)
+    }
+    debug('done creating descriptor object')
+    debug('calling Object.defineProperties() with %d entries', num)
+    Object.defineProperties(e, desc);
+    debug('finished Object.defineProperties()')
+    e.__length__ = length
+  }
+}
+
+e.__get__ = function () {
+  throw new Error('you have to implement the __get__ function')
+}
+
+e.__set__ = function () {
+  throw new Error('you have to implement the __set__ function')
+}
+
+function setup (index) {
+  function get () {
+    return this.__get__(index)
+  }
+  function set (v) {
+    return this.__set__(index, v)
+  }
+  return {
+      enumerable: true
+    , configurable: true
+    , get: get
+    , set: set
+  }
+}
+
+// just define the 100,000 entries for you.
+// takes like 450ms on my comp :\
+debug('defining the first 100,000 entries')
+e.__ensureLength__(100 * 1000)
+debug('DONE defining the first 100,000 entries!')

package.json

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+{ "name": "array-index"
+, "description": "Invoke getter/setter functions on array-like objects"
+, "keywords": [
+    "index"
+  , "array"
+  , "getter"
+  , "setter"
+  , "proxy"
+  ]
+, "version": "0.0.0"
+, "author": "Nathan Rajlich <nathan@tootallnate.net> (http://tootallnate.net)"
+, "repository": { "type": "git", "url": "git://github.com/TooTallNate/array-index.git" }
+, "main": "./index.js"
+, "scripts": {
+      "test": "mocha -gc --reporter spec"
+  }
+, "dependencies": {
+      "debug": "*"
+  }
+, "engines": { "node": "*" }
+}

test.js

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+
+var ArrayIndex = require('./')
+
+
+/**
+ * Create a "subclass".
+ */
+
+function Arrayish (length) {
+  ArrayIndex.__ensureLength__(length)
+}
+
+// inherit from `ArrayIndex`
+Arrayish.prototype = Object.create(ArrayIndex)
+
+// define the index getter function
+Arrayish.prototype.__get__ = function get (index) {
+  console.error('invoking indexed getter: %d!', index)
+  return index
+}
+
+module.exports = Arrayish