HORIZON PROJECT

var toInteger = require('./toInteger');

/** Error message constants. */

var FUNC_ERROR_TEXT = 'Expected a function';

/**

 * The opposite of `_.before`; this method creates a function that invokes

 * `func` once it's called `n` or more times.

 *

 * @static

 * @memberOf _

 * @since 0.1.0

 * @category Function

 * @param {number} n The number of calls before `func` is invoked.

 * @param {Function} func The function to restrict.

 * @returns {Function} Returns the new restricted function.

 * @example

 *

 * var saves = ['profile', 'settings'];

 *

 * var done = _.after(saves.length, function() {

 *   console.log('done saving!');

 * });

 *

 * _.forEach(saves, function(type) {

 *   asyncSave({ 'type': type, 'complete': done });

 * });

 * // => Logs 'done saving!' after the two async saves have completed.

 */

function after(n, func) {

  if (typeof func != 'function') {

    throw new TypeError(FUNC_ERROR_TEXT);

  }

  n = toInteger(n);

  return function() {

    if (--n < 1) {

      return func.apply(this, arguments);

    }

  };

}

module.exports = after;