my-idlers/node_modules/collect.js/dist/methods/pluck.js

'use strict';

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

var nestedValue = require('../helpers/nestedValue');

var buildKeyPathMap = function buildKeyPathMap(items) {
  var keyPaths = {};

  items.forEach(function (item, index) {
    function buildKeyPath(val, keyPath) {
      if (isObject(val)) {
        Object.keys(val).forEach(function (prop) {
          buildKeyPath(val[prop], keyPath + '.' + prop);
        });
      } else if (isArray(val)) {
        val.forEach(function (v, i) {
          buildKeyPath(v, keyPath + '.' + i);
        });
      }

      keyPaths[keyPath] = val;
    }

    buildKeyPath(item, index);
  });

  return keyPaths;
};

module.exports = function pluck(value, key) {
  if (value.indexOf('*') !== -1) {
    var keyPathMap = buildKeyPathMap(this.items);

    var keyMatches = [];

    if (key !== undefined) {
      var keyRegex = new RegExp('0.' + key, 'g');
      var keyNumberOfLevels = ('0.' + key).split('.').length;

      Object.keys(keyPathMap).forEach(function (k) {
        var matchingKey = k.match(keyRegex);

        if (matchingKey) {
          var match = matchingKey[0];

          if (match.split('.').length === keyNumberOfLevels) {
            keyMatches.push(keyPathMap[match]);
          }
        }
      });
    }

    var valueMatches = [];
    var valueRegex = new RegExp('0.' + value, 'g');
    var valueNumberOfLevels = ('0.' + value).split('.').length;

    Object.keys(keyPathMap).forEach(function (k) {
      var matchingValue = k.match(valueRegex);

      if (matchingValue) {
        var match = matchingValue[0];

        if (match.split('.').length === valueNumberOfLevels) {
          valueMatches.push(keyPathMap[match]);
        }
      }
    });

    if (key !== undefined) {
      var collection = {};

      this.items.forEach(function (item, index) {
        collection[keyMatches[index] || ''] = valueMatches;
      });

      return new this.constructor(collection);
    }

    return new this.constructor([valueMatches]);
  }

  if (key !== undefined) {
    var _collection = {};

    this.items.forEach(function (item) {
      if (nestedValue(item, value) !== undefined) {
        _collection[item[key] || ''] = nestedValue(item, value);
      } else {
        _collection[item[key] || ''] = null;
      }
    });

    return new this.constructor(_collection);
  }

  return this.map(function (item) {
    if (nestedValue(item, value) !== undefined) {
      return nestedValue(item, value);
    }

    return null;
  });
};