'use strict';
var $ = require('../internals/export');
+var call = require('../internals/function-call');
+var uncurryThis = require('../internals/function-uncurry-this');
+var aCallable = require('../internals/a-callable');
+var getIterator = require('../internals/get-iterator');
var iterate = require('../internals/iterate');
-var aFunction = require('../internals/a-function');
+
+var push = uncurryThis([].push);
// `Map.groupBy` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', stat: true }, {
groupBy: function groupBy(iterable, keyDerivative) {
+ aCallable(keyDerivative);
+ var iterator = getIterator(iterable);
var newMap = new this();
- aFunction(keyDerivative);
- var has = aFunction(newMap.has);
- var get = aFunction(newMap.get);
- var set = aFunction(newMap.set);
- iterate(iterable, function (element) {
+ var has = aCallable(newMap.has);
+ var get = aCallable(newMap.get);
+ var set = aCallable(newMap.set);
+ iterate(iterator, function (element) {
var derivedKey = keyDerivative(element);
- if (!has.call(newMap, derivedKey)) set.call(newMap, derivedKey, [element]);
- else get.call(newMap, derivedKey).push(element);
- });
+ if (!call(has, newMap, derivedKey)) call(set, newMap, derivedKey, [element]);
+ else push(call(get, newMap, derivedKey), element);
+ }, { IS_ITERATOR: true });
return newMap;
}
});