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Viewing file:     array-unique-by.js (1.23 KB)      -rwxrwxr-x

'use strict';
var getBuiltIn = require('../internals/get-built-in');
var uncurryThis = require('../internals/function-uncurry-this');
var aCallable = require('../internals/a-callable');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var toObject = require('../internals/to-object');
var arraySpeciesCreate = require('../internals/array-species-create');

var Map = getBuiltIn('Map');
var MapPrototype = Map.prototype;
var mapForEach = uncurryThis(MapPrototype.forEach);
var mapHas = uncurryThis(MapPrototype.has);
var mapSet = uncurryThis(MapPrototype.set);
var push = uncurryThis([].push);

// `Array.prototype.uniqueBy` method
// https://github.com/tc39/proposal-array-unique
module.exports = function uniqueBy(resolver) {
  var that = toObject(this);
  var length = lengthOfArrayLike(that);
  var result = arraySpeciesCreate(that, 0);
  var map = new Map();
  var resolverFunction = resolver != null ? aCallable(resolver) : function (value) {
    return value;
  };
  var index, item, key;
  for (index = 0; index < length; index++) {
    item = that[index];
    key = resolverFunction(item);
    if (!mapHas(map, key)) mapSet(map, key, item);
  }
  mapForEach(map, function (value) {
    push(result, value);
  });
  return result;
};