__ __ __ __ _____ _ _ _____ _ _ _
| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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For_More_Tools:
var hasOwnProperty = Object.prototype.hasOwnProperty
module.exports = PseudoMap
function PseudoMap (set) {
if (!(this instanceof PseudoMap)) // whyyyyyyy
throw new TypeError("Constructor PseudoMap requires 'new'")
this.clear()
if (set) {
if ((set instanceof PseudoMap) ||
(typeof Map === 'function' && set instanceof Map))
set.forEach(function (value, key) {
this.set(key, value)
}, this)
else if (Array.isArray(set))
set.forEach(function (kv) {
this.set(kv[0], kv[1])
}, this)
else
throw new TypeError('invalid argument')
}
}
PseudoMap.prototype.forEach = function (fn, thisp) {
thisp = thisp || this
Object.keys(this._data).forEach(function (k) {
if (k !== 'size')
fn.call(thisp, this._data[k].value, this._data[k].key)
}, this)
}
PseudoMap.prototype.has = function (k) {
return !!find(this._data, k)
}
PseudoMap.prototype.get = function (k) {
var res = find(this._data, k)
return res && res.value
}
PseudoMap.prototype.set = function (k, v) {
set(this._data, k, v)
}
PseudoMap.prototype.delete = function (k) {
var res = find(this._data, k)
if (res) {
delete this._data[res._index]
this._data.size--
}
}
PseudoMap.prototype.clear = function () {
var data = Object.create(null)
data.size = 0
Object.defineProperty(this, '_data', {
value: data,
enumerable: false,
configurable: true,
writable: false
})
}
Object.defineProperty(PseudoMap.prototype, 'size', {
get: function () {
return this._data.size
},
set: function (n) {},
enumerable: true,
configurable: true
})
PseudoMap.prototype.values =
PseudoMap.prototype.keys =
PseudoMap.prototype.entries = function () {
throw new Error('iterators are not implemented in this version')
}
// Either identical, or both NaN
function same (a, b) {
return a === b || a !== a && b !== b
}
function Entry (k, v, i) {
this.key = k
this.value = v
this._index = i
}
function find (data, k) {
for (var i = 0, s = '_' + k, key = s;
hasOwnProperty.call(data, key);
key = s + i++) {
if (same(data[key].key, k))
return data[key]
}
}
function set (data, k, v) {
for (var i = 0, s = '_' + k, key = s;
hasOwnProperty.call(data, key);
key = s + i++) {
if (same(data[key].key, k)) {
data[key].value = v
return
}
}
data.size++
data[key] = new Entry(k, v, key)
}