.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/modules/esnext.map.group-by.js

   1 'use strict';
   2 var $ = require('../internals/export');
   3 var call = require('../internals/function-call');
   4 var uncurryThis = require('../internals/function-uncurry-this');
   5 var aCallable = require('../internals/a-callable');
   6 var getIterator = require('../internals/get-iterator');
   7 var iterate = require('../internals/iterate');
   8
   9 var push = uncurryThis([].push);
  10
  11 // `Map.groupBy` method
  12 // https://github.com/tc39/proposal-collection-methods
  13 $({ target: 'Map', stat: true }, {
  14   groupBy: function groupBy(iterable, keyDerivative) {
  15     aCallable(keyDerivative);
  16     var iterator = getIterator(iterable);
  17     var newMap = new this();
  18     var has = aCallable(newMap.has);
  19     var get = aCallable(newMap.get);
  20     var set = aCallable(newMap.set);
  21     iterate(iterator, function (element) {
  22       var derivedKey = keyDerivative(element);
  23       if (!call(has, newMap, derivedKey)) call(set, newMap, derivedKey, [element]);
  24       else push(call(get, newMap, derivedKey), element);
  25     }, { IS_ITERATOR: true });
  26     return newMap;
  27   }
  28 });