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'use strict';

var name = require('fn.name');

/**
 * Wrap callbacks to prevent double execution.
 *
 * @param {Function} fn Function that should only be called once.
 * @returns {Function} A wrapped callback which prevents multiple executions.
 * @public
 */
module.exports = function one(fn) {
  var called = 0
    , value;

/**
   * The function that prevents double execution.
   *
   * @private
   */
  function onetime() {
    if (called) return value;

called = 1;
    value = fn.apply(this, arguments);
    fn = null;

return value;
  }

//
  // To make debugging more easy we want to use the name of the supplied
  // function. So when you look at the functions that are assigned to event
  // listeners you don't see a load of `onetime` functions but actually the
  // names of the functions that this module will call.
  //
  // NOTE: We cannot override the `name` property, as that is `readOnly`
  // property, so displayName will have to do.
  //
  onetime.displayName = name(fn);
  return onetime;
};

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Name	Size	Perms	Modified	Actions
async.js	1.03 KB	lrw-r--r--	2026-02-21 00:53:18	Edit Download recursive recursive
index.js	1.00 KB	lrw-r--r--	2026-02-21 00:53:20	Edit Download recursive recursive
LICENSE	1.09 KB	lrw-r--r--	2026-02-21 00:53:22	Edit Download recursive recursive
package.json	734 B	lrw-r--r--	2026-02-21 00:53:18	Edit Download recursive recursive
README.md	2.11 KB	lrw-r--r--	2026-02-21 00:53:22	Edit Download recursive recursive

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