h2m (215f755) for web/javascript/ref/glob/map (#6194)

Author: Gregoor

files/en-us/web/javascript/reference/global_objects/map/@@iterator/index.html

@@ -0,0 +1,86 @@
+---
+title: Map.prototype[@@iterator]()
+slug: Web/JavaScript/Reference/Global_Objects/Map/@@iterator
+tags:
+  - ECMAScript 2015
+  - Iterator
+  - JavaScript
+  - Map
+  - Method
+  - Prototype
+  - Reference
+browser-compat: javascript.builtins.Map.@@iterator
+---
+{{JSRef}}
+
+<p class="seoSummary">The initial value of the <strong><code>@@iterator</code></strong>
+property is the same function object as the initial value of the
+{{jsxref("Map.prototype.entries()", "entries")}} method.</p>
+
+{{EmbedInteractiveExample("pages/js/map-prototype-@@iterator.html")}}
+
+## Syntax
+
+```js
+myMap[Symbol.iterator]
+```
+
+### Return value
+
+The map **iterator** function, which is the
+{{jsxref("Map.prototype.entries()", "entries()")}} function by
+default.
+
+## Examples
+
+### Using \[@@iterator]\()
+
+```js
+const myMap = new Map()
+myMap.set('0', 'foo')
+myMap.set(1, 'bar')
+myMap.set({}, 'baz')
+
+const mapIter = myMap[Symbol.iterator]()
+
+console.log(mapIter.next().value) // ["0", "foo"]
+console.log(mapIter.next().value) // [1, "bar"]
+console.log(mapIter.next().value) // [Object, "baz"]
+```
+
+### Using \[@@iterator]\() with for..of
+
+```js
+const myMap = new Map()
+myMap.set('0', 'foo')
+myMap.set(1, 'bar')
+myMap.set({}, 'baz')
+
+for (const entry of myMap) {
+  console.log(entry)
+}
+// ["0", "foo"]
+// [1, "bar"]
+// [{}, "baz"]
+
+for (const [key, value] of myMap) {
+  console.log(`${key}: ${value}`)
+}
+// 0: foo
+// 1: bar
+// [Object]: baz
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{jsxref("Map.prototype.entries()")}}
+- {{jsxref("Map.prototype.keys()")}}
+- {{jsxref("Map.prototype.values()")}}

files/en-us/web/javascript/reference/global_objects/map/@@iterator/index.md

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+---
+title: get Map[@@species]
+slug: Web/JavaScript/Reference/Global_Objects/Map/@@species
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Map
+  - Property
+browser-compat: javascript.builtins.Map.@@species
+---
+{{JSRef}}
+
+The **`Map[@@species]`** accessor property returns the `Map` constructor.
+
+## Description
+
+The species accessor property returns the default constructor for `Map` objects.
+Subclass constructors may over-ride it to change the constructor assignment.
+
+## Examples
+
+### Species in ordinary objects
+
+The species property returns the default constructor function, which is the
+`Map` constructor for `Map` objects:
+
+```js
+Map[Symbol.species]; // function Map()
+```
+
+### Species in derived objects
+
+In a derived collection object (e.g. your custom map `MyMap`), the `MyMap`
+species is the `MyMap` constructor. However, you might want to overwrite this,
+in order to return parent `Map` objects in your derived class methods:
+
+```js
+class MyMap extends Map {
+  // Overwrite MyMap species to the parent Map constructor
+  static get [Symbol.species]() { return Map; }
+}
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{jsxref("Map")}}
+- {{jsxref("Symbol.species")}}

files/en-us/web/javascript/reference/global_objects/map/@@species/index.html

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+---
+title: Map.prototype[@@toStringTag]
+slug: Web/JavaScript/Reference/Global_Objects/Map/@@toStringTag
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Map
+  - Property
+  - Prototype
+  - Reference
+browser-compat: javascript.builtins.Map.@@toStringTag
+---
+{{JSRef}}
+
+The **`Map[@@toStringTag]`** property has an initial value of "Map".
+
+{{EmbedInteractiveExample("pages/js/map-prototype-@@tostringtag.html","shorter")}}{{js_property_attributes(0,0,1)}}
+
+## Syntax
+
+```js
+Map[Symbol.toStringTag]
+```
+
+## Examples
+
+### Using toStringTag
+
+```js
+Object.prototype.toString.call(new Map()) // "[object Map]"
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{jsxref("Symbol.toStringTag")}}