npm/node_modules/lodash._baseuniq/index.js

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/**
 * lodash 3.0.2 (Custom Build) <https://lodash.com/>
 * Build: `lodash modern modularize exports="npm" -o ./`
 * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.8.2 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
var baseIndexOf = require('lodash._baseindexof'),
    cacheIndexOf = require('lodash._cacheindexof'),
    createCache = require('lodash._createcache');

/**
 * The base implementation of `_.uniq` without support for callback shorthands
 * and `this` binding.
 *
 * @private
 * @param {Array} array The array to inspect.
 * @param {Function} [iteratee] The function invoked per iteration.
 * @returns {Array} Returns the new duplicate-value-free array.
 */
function baseUniq(array, iteratee) {
  var index = -1,
      indexOf = baseIndexOf,
      length = array.length,
      isCommon = true,
      isLarge = isCommon && length >= 200,
      seen = isLarge ? createCache() : null,
      result = [];

  if (seen) {
    indexOf = cacheIndexOf;
    isCommon = false;
  } else {
    isLarge = false;
    seen = iteratee ? [] : result;
  }
  outer:
  while (++index < length) {
    var value = array[index],
        computed = iteratee ? iteratee(value, index, array) : value;

    if (isCommon && value === value) {
      var seenIndex = seen.length;
      while (seenIndex--) {
        if (seen[seenIndex] === computed) {
          continue outer;
        }
      }
      if (iteratee) {
        seen.push(computed);
      }
      result.push(value);
    }
    else if (indexOf(seen, computed, 0) < 0) {
      if (iteratee || isLarge) {
        seen.push(computed);
      }
      result.push(value);
    }
  }
  return result;
}

module.exports = baseUniq;