--- /dev/null
+'use strict';
+var $ = require('../internals/export');
+var IS_PURE = require('../internals/is-pure');
+var anObject = require('../internals/an-object');
+var aFunction = require('../internals/a-function');
+var iterate = require('../internals/iterate');
+
+// `Map.prototype.merge` method
+// https://github.com/tc39/proposal-collection-methods
+$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
+ // eslint-disable-next-line no-unused-vars
+ merge: function merge(iterable /* ...iterbles */) {
+ var map = anObject(this);
+ var setter = aFunction(map.set);
+ var i = 0;
+ while (i < arguments.length) {
+ iterate(arguments[i++], setter, map, true);
+ }
+ return map;
+ }
+});