/**
 * lodash 3.0.0 (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 1.7.0 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
var before = require('lodash.before');

/**
 * Creates a function that is restricted to invoking `func` once. Repeat calls
 * to the function return the value of the first call. The `func` is invoked
 * with the `this` binding and arguments of the created function.
 *
 * @static
 * @memberOf _
 * @category Function
 * @param {Function} func The function to restrict.
 * @returns {Function} Returns the new restricted function.
 * @example
 *
 * var initialize = _.once(createApplication);
 * initialize();
 * initialize();
 * // `initialize` invokes `createApplication` once
 */
function once(func) {
  return before(func, 2);
}

module.exports = once;