var map = require('./map'),
    property = require('../utility/property');

/**
 * Gets the property value of `path` from all elements in `collection`.
 *
 * @static
 * @memberOf _
 * @category Collection
 * @param {Array|Object|string} collection The collection to iterate over.
 * @param {Array|string} path The path of the property to pluck.
 * @returns {Array} Returns the property values.
 * @example
 *
 * var users = [
 *   { 'user': 'barney', 'age': 36 },
 *   { 'user': 'fred',   'age': 40 }
 * ];
 *
 * _.pluck(users, 'user');
 * // => ['barney', 'fred']
 *
 * var userIndex = _.indexBy(users, 'user');
 * _.pluck(userIndex, 'age');
 * // => [36, 40] (iteration order is not guaranteed)
 */
function pluck(collection, path) {
  return map(collection, property(path));
}

module.exports = pluck;