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

   1 'use strict';
   2 var $ = require('../internals/export');
   3 var iterate = require('../internals/iterate');
   4 var aFunction = require('../internals/a-function');
   5
   6 // `Map.keyBy` method
   7 // https://github.com/tc39/proposal-collection-methods
   8 $({ target: 'Map', stat: true }, {
   9   keyBy: function keyBy(iterable, keyDerivative) {
  10     var newMap = new this();
  11     aFunction(keyDerivative);
  12     var setter = aFunction(newMap.set);
  13     iterate(iterable, function (element) {
  14       setter.call(newMap, keyDerivative(element), element);
  15     });
  16     return newMap;
  17   }
  18 });