.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/modules/esnext.array.unique-by.js

   1 'use strict';
   2 var $ = require('../internals/export');
   3 var toLength = require('../internals/to-length');
   4 var toObject = require('../internals/to-object');
   5 var getBuiltIn = require('../internals/get-built-in');
   6 var arraySpeciesCreate = require('../internals/array-species-create');
   7 var addToUnscopables = require('../internals/add-to-unscopables');
   8
   9 var push = [].push;
  10
  11 // `Array.prototype.uniqueBy` method
  12 // https://github.com/tc39/proposal-array-unique
  13 $({ target: 'Array', proto: true }, {
  14   uniqueBy: function uniqueBy(resolver) {
  15     var that = toObject(this);
  16     var length = toLength(that.length);
  17     var result = arraySpeciesCreate(that, 0);
  18     var Map = getBuiltIn('Map');
  19     var map = new Map();
  20     var resolverFunction, index, item, key;
  21     if (typeof resolver == 'function') resolverFunction = resolver;
  22     else if (resolver == null) resolverFunction = function (value) {
  23       return value;
  24     };
  25     else throw new TypeError('Incorrect resolver!');
  26     for (index = 0; index < length; index++) {
  27       item = that[index];
  28       key = resolverFunction(item);
  29       if (!map.has(key)) map.set(key, item);
  30     }
  31     map.forEach(function (value) {
  32       push.call(result, value);
  33     });
  34     return result;
  35   }
  36 });
  37
  38 addToUnscopables('uniqueBy');