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Tutur33
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The ISC License
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Copyright (c) Isaac Z. Schlueter and Contributors
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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# pseudomap
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A thing that is a lot like ES6 `Map`, but without iterators, for use
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in environments where `for..of` syntax and `Map` are not available.
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If you need iterators, or just in general a more faithful polyfill to
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ES6 Maps, check out [es6-map](http://npm.im/es6-map).
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If you are in an environment where `Map` is supported, then that will
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be returned instead, unless `process.env.TEST_PSEUDOMAP` is set.
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You can use any value as keys, and any value as data. Setting again
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with the identical key will overwrite the previous value.
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Internally, data is stored on an `Object.create(null)` style object.
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The key is coerced to a string to generate the key on the internal
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data-bag object. The original key used is stored along with the data.
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In the event of a stringified-key collision, a new key is generated by
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appending an increasing number to the stringified-key until finding
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either the intended key or an empty spot.
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Note that because object traversal order of plain objects is not
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guaranteed to be identical to insertion order, the insertion order
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guarantee of `Map.prototype.forEach` is not guaranteed in this
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implementation. However, in all versions of Node.js and V8 where this
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module works, `forEach` does traverse data in insertion order.
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## API
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Most of the [Map
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API](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map),
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with the following exceptions:
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1. A `Map` object is not an iterator.
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2. `values`, `keys`, and `entries` methods are not implemented,
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because they return iterators.
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3. The argument to the constructor can be an Array of `[key, value]`
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pairs, or a `Map` or `PseudoMap` object. But, since iterators
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aren't used, passing any plain-old iterator won't initialize the
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map properly.
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## USAGE
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Use just like a regular ES6 Map.
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```javascript
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var PseudoMap = require('pseudomap')
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// optionally provide a pseudomap, or an array of [key,value] pairs
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// as the argument to initialize the map with
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var myMap = new PseudoMap()
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myMap.set(1, 'number 1')
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myMap.set('1', 'string 1')
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var akey = {}
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var bkey = {}
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myMap.set(akey, { some: 'data' })
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myMap.set(bkey, { some: 'other data' })
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```
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if (process.env.npm_package_name === 'pseudomap' &&
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process.env.npm_lifecycle_script === 'test')
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process.env.TEST_PSEUDOMAP = 'true'
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if (typeof Map === 'function' && !process.env.TEST_PSEUDOMAP) {
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module.exports = Map
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} else {
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module.exports = require('./pseudomap')
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}
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{
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"name": "pseudomap",
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"version": "1.0.2",
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"description": "A thing that is a lot like ES6 `Map`, but without iterators, for use in environments where `for..of` syntax and `Map` are not available.",
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"main": "map.js",
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"directories": {
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"test": "test"
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},
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"devDependencies": {
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"tap": "^2.3.1"
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},
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"scripts": {
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"test": "tap test/*.js"
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},
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"repository": {
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"type": "git",
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"url": "git+https://github.com/isaacs/pseudomap.git"
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},
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"author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)",
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"license": "ISC",
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"bugs": {
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"url": "https://github.com/isaacs/pseudomap/issues"
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},
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"homepage": "https://github.com/isaacs/pseudomap#readme"
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}
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var hasOwnProperty = Object.prototype.hasOwnProperty
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module.exports = PseudoMap
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function PseudoMap (set) {
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if (!(this instanceof PseudoMap)) // whyyyyyyy
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throw new TypeError("Constructor PseudoMap requires 'new'")
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this.clear()
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if (set) {
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if ((set instanceof PseudoMap) ||
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(typeof Map === 'function' && set instanceof Map))
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set.forEach(function (value, key) {
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this.set(key, value)
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}, this)
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else if (Array.isArray(set))
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set.forEach(function (kv) {
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this.set(kv[0], kv[1])
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}, this)
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else
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throw new TypeError('invalid argument')
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}
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}
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PseudoMap.prototype.forEach = function (fn, thisp) {
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thisp = thisp || this
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Object.keys(this._data).forEach(function (k) {
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if (k !== 'size')
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fn.call(thisp, this._data[k].value, this._data[k].key)
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}, this)
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}
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PseudoMap.prototype.has = function (k) {
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return !!find(this._data, k)
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}
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PseudoMap.prototype.get = function (k) {
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var res = find(this._data, k)
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return res && res.value
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}
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PseudoMap.prototype.set = function (k, v) {
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set(this._data, k, v)
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}
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PseudoMap.prototype.delete = function (k) {
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var res = find(this._data, k)
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if (res) {
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delete this._data[res._index]
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this._data.size--
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}
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}
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PseudoMap.prototype.clear = function () {
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var data = Object.create(null)
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data.size = 0
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Object.defineProperty(this, '_data', {
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value: data,
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enumerable: false,
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configurable: true,
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writable: false
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})
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}
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Object.defineProperty(PseudoMap.prototype, 'size', {
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get: function () {
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return this._data.size
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},
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set: function (n) {},
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enumerable: true,
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configurable: true
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})
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PseudoMap.prototype.values =
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PseudoMap.prototype.keys =
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PseudoMap.prototype.entries = function () {
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throw new Error('iterators are not implemented in this version')
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}
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// Either identical, or both NaN
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function same (a, b) {
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return a === b || a !== a && b !== b
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}
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function Entry (k, v, i) {
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this.key = k
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this.value = v
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this._index = i
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}
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function find (data, k) {
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for (var i = 0, s = '_' + k, key = s;
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hasOwnProperty.call(data, key);
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key = s + i++) {
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if (same(data[key].key, k))
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return data[key]
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}
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}
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function set (data, k, v) {
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for (var i = 0, s = '_' + k, key = s;
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hasOwnProperty.call(data, key);
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key = s + i++) {
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if (same(data[key].key, k)) {
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data[key].value = v
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return
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}
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}
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data.size++
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data[key] = new Entry(k, v, key)
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}
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