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2020-2-capstone-design2 / 2017110267

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  • once.js
  • Flare-k's avatar
    Setting Environment · 4ae4e6dd
    4ae4e6dd
    Flare-k authored 2020-10-13 19:52:07 +0900
once.js 198 Bytes
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'use strict';

module.exports = function once(fn) {
  let called = false;
  return function() {
    if (called) {
      return;
    }
    called = true;
    return fn.apply(null, arguments);
  };
};