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Viewing file:     unique.js (831 B)      -rwxrwxr-x

'use strict';

var _require = require('../helpers/is'),
    isFunction = _require.isFunction;

module.exports = function unique(key) {
  var collection = void 0;

  if (key === undefined) {
    collection = this.items.filter(function (element, index, self) {
      return self.indexOf(element) === index;
    });
  } else {
    collection = [];

    var usedKeys = [];

    for (var iterator = 0, length = this.items.length; iterator < length; iterator += 1) {
      var uniqueKey = void 0;
      if (isFunction(key)) {
        uniqueKey = key(this.items[iterator]);
      } else {
        uniqueKey = this.items[iterator][key];
      }

      if (usedKeys.indexOf(uniqueKey) === -1) {
        collection.push(this.items[iterator]);
        usedKeys.push(uniqueKey);
      }
    }
  }

  return new this.constructor(collection);
};