think49/map-prototype-sort-1.0.0.js

## readme.md

      
    Raw
  

              readme.md
            
          
    map-prototype-sort.js

概要

Map.prototype.sort に Array.prototype.sort 互換のメソッドを定義します。
使い方

Map.prototype.sort(comparefn)

第一引数に指定された比較関数を基準として、ソートした Map オブジェクトを返します。
var map = new Map([['a',2],['b',1],['c',3]]).sort((a,b) => a[1] - b[1]);

console.log(JSON.stringify([...map]));	// [["b",1],["a",2],["c",3]]
Map.prototype.sort は破壊的です。
var map = new Map([[3, 'c'],[2, 'b'],[4, 'd'],[1, 'a']]);

map.sort((a,b) => a[0] - b[0]);
console.log(JSON.stringify([...map]));	// [[1,"a"],[2,"b"],[3,"c"],[4,"d"]]

  
## map-prototype-sort-1.0.0.js
/**
 * map-prototype-sort-1.0.0.js
 * Sort map object.
 *
 * @version 1.0.0
 * @author think49
 * @url https://gist.github.com/think49/daaf5ee0a4f12092862c81c54747bae5
 * @license http://www.opensource.org/licenses/mit-license.php (The MIT License)
 */

if (typeof Map === 'function' && !('sort' in Map.prototype) && typeof Object.defineProperties === 'function') {
  Object.defineProperties(Map.prototype, {sort: {
    writable: true,
    enumerable: false,
    configurable: true,
    value: function sort (comparefn) {
      var entries = [...this.entries()].sort(comparefn);

      this.clear();

      for (let [key, value] of entries) {
        this.set(key, value);
      }

      return this;
    }
  }});
}

## test.html
<!DOCTYPE html>
<head>
  <title>test</title>
<style>

</style>
</head>
<body>

<script src="map-prototype-sort-1.0.0.js"></script>
<script>
'use strict';
console.assert(JSON.stringify([...new Map([['a',2],['b',1],['c',3]]).sort((a,b) => a[1] - b[1])]) === '[["b",1],["a",2],["c",3]]');

var map = new Map([[3, 'c'],[2, 'b'],[4, 'd'],[1, 'a']]);
map.sort((a,b) => a[0] - b[0]);
console.assert(JSON.stringify([...map]) === '[[1,"a"],[2,"b"],[3,"c"],[4,"d"]]');
</script>

</body>
</html>
	/**
	* map-prototype-sort-1.0.0.js
	* Sort map object.
	*
	* @version 1.0.0
	* @author think49
	* @url https://gist.github.com/think49/daaf5ee0a4f12092862c81c54747bae5
	* @license http://www.opensource.org/licenses/mit-license.php (The MIT License)
	*/

	if (typeof Map === 'function' && !('sort' in Map.prototype) && typeof Object.defineProperties === 'function') {
	Object.defineProperties(Map.prototype, {sort: {
	writable: true,
	enumerable: false,
	configurable: true,
	value: function sort (comparefn) {
	var entries = [...this.entries()].sort(comparefn);

	this.clear();

	for (let [key, value] of entries) {
	this.set(key, value);
	}

	return this;
	}
	}});
	}
	<!DOCTYPE html>
	<head>
	<title>test</title>
	<style>

	</style>
	</head>
	<body>

	<script src="map-prototype-sort-1.0.0.js"></script>
	<script>
	'use strict';
	console.assert(JSON.stringify([...new Map([['a',2],['b',1],['c',3]]).sort((a,b) => a[1] - b[1])]) === '[["b",1],["a",2],["c",3]]');

	var map = new Map([[3, 'c'],[2, 'b'],[4, 'd'],[1, 'a']]);
	map.sort((a,b) => a[0] - b[0]);
	console.assert(JSON.stringify([...map]) === '[[1,"a"],[2,"b"],[3,"c"],[4,"d"]]');
	</script>

	</body>
	</html>