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Jun 21st, 2018
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  1. > function Class(param) { if (!param) console.log('fail'); }
  2. > new Class
  3. fail
  4. {}
  5. > x = {};
  6. {}
  7. > x.__proto__ = Class.prototype;
  8. {}
  9. > x instanceof Class
  10. true
  11. > Class.call(x, 'bar');
  12. >
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